Do not rely on config.SERVER_MODE for determining (if it is running from

runtime, or time), instead check the environment variable PGADMIN_PORT
to do that as per Dave.

web/pgadmin/misc/bgprocess/processes.py

@@ -33,6 +33,13 @@ if sys.version_info < (3,):
 else:
     from io import StringIO
 
+# The port number should have already been set by the runtime if we're running
+# in desktop mode.
+PGADMIN_RUNTIME = False
+
+if 'PGADMIN_PORT' in globals():
+    PGADMIN_RUNTIME = True
+
 
 def get_current_time(format='%Y-%m-%d %H:%M:%S.%f %z'):
     """
@@ -181,7 +188,7 @@ class BatchProcess(object):
 
         p = None
         cmd = [
-            (sys.executable if config.SERVER_MODE else
+            (sys.executable if not PGADMIN_RUNTIME else
                 'pythonw.exe' if os.name == 'nt' else 'python'),
             executor,
             '-p', self.id,