weedwakerwilson wrote on Aug 29^th, 2013 at 9:57pm:

If someone can please help me it will be greatly appreciated, After I start both engines for some reason I cannot shut off the APU. I try using the switch and it will not move to the off position only the start position. If I click the switch too much it will get stuck in the start position and will not move anywhere.  I have tried uninstalling and reinstalling and nothing seems to work. Any help is welcome! Thank you

Have you tried clicking on the APU switch using the right mouse button? That should turn the APU off.