diff --git a/wp-includes/css/wp-auth-check-rtl.css b/wp-includes/css/wp-auth-check-rtl.css
index 888d4323a8..d370dd8431 100644
--- a/wp-includes/css/wp-auth-check-rtl.css
+++ b/wp-includes/css/wp-auth-check-rtl.css
@@ -34,6 +34,14 @@
 	box-shadow: 0 3px 6px rgba( 0, 0, 0, 0.3 );
 }
 
+@media screen and ( max-width: 380px ) {
+	#wp-auth-check-wrap #wp-auth-check {
+		right: 0;
+		width: 100%;
+		margin: 0;
+	}
+}
+
 #wp-auth-check-wrap.fallback #wp-auth-check {
 	max-height: 180px;
 	overflow: auto;
@@ -44,12 +52,13 @@
 	-webkit-background-size: 16px 16px;
 	background-size: 16px 16px;
 	height: 100%;
+	overflow: auto;
+	-webkit-overflow-scrolling: touch;
 }
 
 #wp-auth-check-wrap #wp-auth-check-form iframe {
-	height: 100%;
+	height: 98%; /* Scrollbar fix */
 	width: 100%;
-	overflow: auto;
 }
 
 #wp-auth-check-wrap .wp-auth-check-close {
diff --git a/wp-includes/css/wp-auth-check-rtl.min.css b/wp-includes/css/wp-auth-check-rtl.min.css
index 369d1297e7..0c3094db1e 100644
--- a/wp-includes/css/wp-auth-check-rtl.min.css
+++ b/wp-includes/css/wp-auth-check-rtl.min.css
@@ -1 +1 @@
-#wp-auth-check-wrap.hidden{display:none}#wp-auth-check-wrap #wp-auth-check-bg{position:fixed;top:0;bottom:0;right:0;left:0;background:#000;opacity:.7;filter:alpha(opacity=70);z-index:1000010}#wp-auth-check-wrap #wp-auth-check{position:fixed;right:50%;overflow:hidden;top:40px;bottom:20px;max-height:415px;width:380px;margin:0 -190px 0 0;padding:30px 0 0;background-color:#f1f1f1;z-index:1000011;-webkit-box-shadow:0 3px 6px rgba(0,0,0,.3);box-shadow:0 3px 6px rgba(0,0,0,.3)}#wp-auth-check-wrap.fallback #wp-auth-check{max-height:180px;overflow:auto}#wp-auth-check-wrap #wp-auth-check-form{background:url(../images/spinner-2x.gif) no-repeat center center;-webkit-background-size:16px 16px;background-size:16px 16px;height:100%}#wp-auth-check-wrap #wp-auth-check-form iframe{height:100%;width:100%;overflow:auto}#wp-auth-check-wrap .wp-auth-check-close{position:absolute;top:8px;left:8px;height:22px;width:22px;cursor:pointer}#wp-auth-check-wrap .wp-auth-check-close:before{content:'\f158';display:block!important;font:400 20px/1 dashicons;speak:none;height:22px;margin:2px 0;text-align:center;width:22px;color:#777;-webkit-font-smoothing:antialiased!important;-moz-osx-font-smoothing:grayscale}#wp-auth-check-wrap .wp-auth-check-close:hover:before{color:#0074a2}#wp-auth-check-wrap .wp-auth-check-close:focus{outline:#888 dotted 1px}#wp-auth-check-wrap .wp-auth-fallback-expired{outline:0}#wp-auth-check-wrap .wp-auth-fallback{font-size:14px;line-height:21px;padding:0 25px;display:none}#wp-auth-check-wrap.fallback .wp-auth-check-close,#wp-auth-check-wrap.fallback .wp-auth-fallback{display:block}
\ No newline at end of file
+#wp-auth-check-wrap.hidden{display:none}#wp-auth-check-wrap #wp-auth-check-bg{position:fixed;top:0;bottom:0;right:0;left:0;background:#000;opacity:.7;filter:alpha(opacity=70);z-index:1000010}#wp-auth-check-wrap #wp-auth-check{position:fixed;right:50%;overflow:hidden;top:40px;bottom:20px;max-height:415px;width:380px;margin:0 -190px 0 0;padding:30px 0 0;background-color:#f1f1f1;z-index:1000011;-webkit-box-shadow:0 3px 6px rgba(0,0,0,.3);box-shadow:0 3px 6px rgba(0,0,0,.3)}@media screen and (max-width:380px){#wp-auth-check-wrap #wp-auth-check{right:0;width:100%;margin:0}}#wp-auth-check-wrap.fallback #wp-auth-check{max-height:180px;overflow:auto}#wp-auth-check-wrap #wp-auth-check-form{background:url(../images/spinner-2x.gif) no-repeat center center;-webkit-background-size:16px 16px;background-size:16px 16px;height:100%;overflow:auto;-webkit-overflow-scrolling:touch}#wp-auth-check-wrap #wp-auth-check-form iframe{height:98%;width:100%}#wp-auth-check-wrap .wp-auth-check-close{position:absolute;top:8px;left:8px;height:22px;width:22px;cursor:pointer}#wp-auth-check-wrap .wp-auth-check-close:before{content:'\f158';display:block!important;font:400 20px/1 dashicons;speak:none;height:22px;margin:2px 0;text-align:center;width:22px;color:#777;-webkit-font-smoothing:antialiased!important;-moz-osx-font-smoothing:grayscale}#wp-auth-check-wrap .wp-auth-check-close:hover:before{color:#0074a2}#wp-auth-check-wrap .wp-auth-check-close:focus{outline:#888 dotted 1px}#wp-auth-check-wrap .wp-auth-fallback-expired{outline:0}#wp-auth-check-wrap .wp-auth-fallback{font-size:14px;line-height:21px;padding:0 25px;display:none}#wp-auth-check-wrap.fallback .wp-auth-check-close,#wp-auth-check-wrap.fallback .wp-auth-fallback{display:block}
\ No newline at end of file
diff --git a/wp-includes/css/wp-auth-check.css b/wp-includes/css/wp-auth-check.css
index b6dd541c22..b5058d208d 100644
--- a/wp-includes/css/wp-auth-check.css
+++ b/wp-includes/css/wp-auth-check.css
@@ -34,6 +34,14 @@
 	box-shadow: 0 3px 6px rgba( 0, 0, 0, 0.3 );
 }
 
+@media screen and ( max-width: 380px ) {
+	#wp-auth-check-wrap #wp-auth-check {
+		left: 0;
+		width: 100%;
+		margin: 0;
+	}
+}
+
 #wp-auth-check-wrap.fallback #wp-auth-check {
 	max-height: 180px;
 	overflow: auto;
@@ -44,12 +52,13 @@
 	-webkit-background-size: 16px 16px;
 	background-size: 16px 16px;
 	height: 100%;
+	overflow: auto;
+	-webkit-overflow-scrolling: touch;
 }
 
 #wp-auth-check-wrap #wp-auth-check-form iframe {
-	height: 100%;
+	height: 98%; /* Scrollbar fix */
 	width: 100%;
-	overflow: auto;
 }
 
 #wp-auth-check-wrap .wp-auth-check-close {
diff --git a/wp-includes/css/wp-auth-check.min.css b/wp-includes/css/wp-auth-check.min.css
index f4ed4a3656..eebd7be004 100644
--- a/wp-includes/css/wp-auth-check.min.css
+++ b/wp-includes/css/wp-auth-check.min.css
@@ -1 +1 @@
-#wp-auth-check-wrap.hidden{display:none}#wp-auth-check-wrap #wp-auth-check-bg{position:fixed;top:0;bottom:0;left:0;right:0;background:#000;opacity:.7;filter:alpha(opacity=70);z-index:1000010}#wp-auth-check-wrap #wp-auth-check{position:fixed;left:50%;overflow:hidden;top:40px;bottom:20px;max-height:415px;width:380px;margin:0 0 0 -190px;padding:30px 0 0;background-color:#f1f1f1;z-index:1000011;-webkit-box-shadow:0 3px 6px rgba(0,0,0,.3);box-shadow:0 3px 6px rgba(0,0,0,.3)}#wp-auth-check-wrap.fallback #wp-auth-check{max-height:180px;overflow:auto}#wp-auth-check-wrap #wp-auth-check-form{background:url(../images/spinner-2x.gif) no-repeat center center;-webkit-background-size:16px 16px;background-size:16px 16px;height:100%}#wp-auth-check-wrap #wp-auth-check-form iframe{height:100%;width:100%;overflow:auto}#wp-auth-check-wrap .wp-auth-check-close{position:absolute;top:8px;right:8px;height:22px;width:22px;cursor:pointer}#wp-auth-check-wrap .wp-auth-check-close:before{content:'\f158';display:block!important;font:400 20px/1 dashicons;speak:none;height:22px;margin:2px 0;text-align:center;width:22px;color:#777;-webkit-font-smoothing:antialiased!important;-moz-osx-font-smoothing:grayscale}#wp-auth-check-wrap .wp-auth-check-close:hover:before{color:#0074a2}#wp-auth-check-wrap .wp-auth-check-close:focus{outline:#888 dotted 1px}#wp-auth-check-wrap .wp-auth-fallback-expired{outline:0}#wp-auth-check-wrap .wp-auth-fallback{font-size:14px;line-height:21px;padding:0 25px;display:none}#wp-auth-check-wrap.fallback .wp-auth-check-close,#wp-auth-check-wrap.fallback .wp-auth-fallback{display:block}
\ No newline at end of file
+#wp-auth-check-wrap.hidden{display:none}#wp-auth-check-wrap #wp-auth-check-bg{position:fixed;top:0;bottom:0;left:0;right:0;background:#000;opacity:.7;filter:alpha(opacity=70);z-index:1000010}#wp-auth-check-wrap #wp-auth-check{position:fixed;left:50%;overflow:hidden;top:40px;bottom:20px;max-height:415px;width:380px;margin:0 0 0 -190px;padding:30px 0 0;background-color:#f1f1f1;z-index:1000011;-webkit-box-shadow:0 3px 6px rgba(0,0,0,.3);box-shadow:0 3px 6px rgba(0,0,0,.3)}@media screen and (max-width:380px){#wp-auth-check-wrap #wp-auth-check{left:0;width:100%;margin:0}}#wp-auth-check-wrap.fallback #wp-auth-check{max-height:180px;overflow:auto}#wp-auth-check-wrap #wp-auth-check-form{background:url(../images/spinner-2x.gif) no-repeat center center;-webkit-background-size:16px 16px;background-size:16px 16px;height:100%;overflow:auto;-webkit-overflow-scrolling:touch}#wp-auth-check-wrap #wp-auth-check-form iframe{height:98%;width:100%}#wp-auth-check-wrap .wp-auth-check-close{position:absolute;top:8px;right:8px;height:22px;width:22px;cursor:pointer}#wp-auth-check-wrap .wp-auth-check-close:before{content:'\f158';display:block!important;font:400 20px/1 dashicons;speak:none;height:22px;margin:2px 0;text-align:center;width:22px;color:#777;-webkit-font-smoothing:antialiased!important;-moz-osx-font-smoothing:grayscale}#wp-auth-check-wrap .wp-auth-check-close:hover:before{color:#0074a2}#wp-auth-check-wrap .wp-auth-check-close:focus{outline:#888 dotted 1px}#wp-auth-check-wrap .wp-auth-fallback-expired{outline:0}#wp-auth-check-wrap .wp-auth-fallback{font-size:14px;line-height:21px;padding:0 25px;display:none}#wp-auth-check-wrap.fallback .wp-auth-check-close,#wp-auth-check-wrap.fallback .wp-auth-fallback{display:block}
\ No newline at end of file
diff --git a/wp-includes/js/wp-auth-check.js b/wp-includes/js/wp-auth-check.js
index e58a27dab9..4c0b71d9c2 100644
--- a/wp-includes/js/wp-auth-check.js
+++ b/wp-includes/js/wp-auth-check.js
@@ -49,6 +49,7 @@
 			$('#wp-auth-check-form').append( frame );
 		}
 
+		$( 'body' ).addClass( 'modal-open' );
 		wrap.removeClass('hidden');
 
 		if ( frame ) {
@@ -80,6 +81,7 @@
 		wrap.fadeOut( 200, function() {
 			wrap.addClass('hidden').css('display', '');
 			$('#wp-auth-check-frame').remove();
+			$( 'body' ).removeClass( 'modal-open' );
 		});
 	}
 
diff --git a/wp-includes/js/wp-auth-check.min.js b/wp-includes/js/wp-auth-check.min.js
index fc7b25c1bf..41a130804d 100644
--- a/wp-includes/js/wp-auth-check.min.js
+++ b/wp-includes/js/wp-auth-check.min.js
@@ -1 +1 @@
-!function(a){function b(){var b,d=a("#wp-auth-check"),f=a("#wp-auth-check-form"),g=e.find(".wp-auth-fallback-expired"),h=!1;f.length&&(a(window).on("beforeunload.wp-auth-check",function(a){a.originalEvent.returnValue=window.authcheckL10n.beforeunload}),b=a('<iframe id="wp-auth-check-frame" frameborder="0">').attr("title",g.text()),b.load(function(){var b,i;h=!0;try{i=a(this).contents().find("body"),b=i.height()}catch(j){return e.addClass("fallback"),d.css("max-height",""),f.remove(),void g.focus()}b?i&&i.hasClass("interim-login-success")?c():d.css("max-height",b+40+"px"):i&&i.length||(e.addClass("fallback"),d.css("max-height",""),f.remove(),g.focus())}).attr("src",f.data("src")),a("#wp-auth-check-form").append(b)),e.removeClass("hidden"),b?(b.focus(),setTimeout(function(){h||(e.addClass("fallback"),f.remove(),g.focus())},1e4)):g.focus()}function c(){a(window).off("beforeunload.wp-auth-check"),"undefined"==typeof adminpage||"post-php"!==adminpage&&"post-new-php"!==adminpage||"undefined"==typeof wp||!wp.heartbeat||wp.heartbeat.connectNow(),e.fadeOut(200,function(){e.addClass("hidden").css("display",""),a("#wp-auth-check-frame").remove()})}function d(){var a=parseInt(window.authcheckL10n.interval,10)||180;f=(new Date).getTime()+1e3*a}var e,f;a(document).on("heartbeat-tick.wp-auth-check",function(a,f){"wp-auth-check"in f&&(d(),!f["wp-auth-check"]&&e.hasClass("hidden")?b():f["wp-auth-check"]&&!e.hasClass("hidden")&&c())}).on("heartbeat-send.wp-auth-check",function(a,b){(new Date).getTime()>f&&(b["wp-auth-check"]=!0)}).ready(function(){d(),e=a("#wp-auth-check-wrap"),e.find(".wp-auth-check-close").on("click",function(){c()})})}(jQuery);
\ No newline at end of file
+!function(a){function b(){var b,d=a("#wp-auth-check"),f=a("#wp-auth-check-form"),g=e.find(".wp-auth-fallback-expired"),h=!1;f.length&&(a(window).on("beforeunload.wp-auth-check",function(a){a.originalEvent.returnValue=window.authcheckL10n.beforeunload}),b=a('<iframe id="wp-auth-check-frame" frameborder="0">').attr("title",g.text()),b.load(function(){var b,i;h=!0;try{i=a(this).contents().find("body"),b=i.height()}catch(j){return e.addClass("fallback"),d.css("max-height",""),f.remove(),void g.focus()}b?i&&i.hasClass("interim-login-success")?c():d.css("max-height",b+40+"px"):i&&i.length||(e.addClass("fallback"),d.css("max-height",""),f.remove(),g.focus())}).attr("src",f.data("src")),a("#wp-auth-check-form").append(b)),a("body").addClass("modal-open"),e.removeClass("hidden"),b?(b.focus(),setTimeout(function(){h||(e.addClass("fallback"),f.remove(),g.focus())},1e4)):g.focus()}function c(){a(window).off("beforeunload.wp-auth-check"),"undefined"==typeof adminpage||"post-php"!==adminpage&&"post-new-php"!==adminpage||"undefined"==typeof wp||!wp.heartbeat||wp.heartbeat.connectNow(),e.fadeOut(200,function(){e.addClass("hidden").css("display",""),a("#wp-auth-check-frame").remove(),a("body").removeClass("modal-open")})}function d(){var a=parseInt(window.authcheckL10n.interval,10)||180;f=(new Date).getTime()+1e3*a}var e,f;a(document).on("heartbeat-tick.wp-auth-check",function(a,f){"wp-auth-check"in f&&(d(),!f["wp-auth-check"]&&e.hasClass("hidden")?b():f["wp-auth-check"]&&!e.hasClass("hidden")&&c())}).on("heartbeat-send.wp-auth-check",function(a,b){(new Date).getTime()>f&&(b["wp-auth-check"]=!0)}).ready(function(){d(),e=a("#wp-auth-check-wrap"),e.find(".wp-auth-check-close").on("click",function(){c()})})}(jQuery);
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 03d4883115..9a89067b08 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-beta3-31944';
+$wp_version = '4.2-beta3-31945';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.