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0e1f616
(Get the code!)
This worked for me - it appears a policykit startup program was launching a KDE rather than a gnome version.
The solution is:
System/
Under the Startup Programs tab uncheck PolicyKit Authentication Agent. Click on Add to create a new startup program. In the Add Startup Program window enter the following in the Command: box -
/usr/lib/
In the Name: box give the new startup program a name -I called mine gnome Policy Kit. Click on save and have this as the new 'policykit startup program'. I can now install programs from the Software Centre.