Not able to move fuel levers in Maddog and DA Fokker 70/100

I just re-installed my flightsim computer since I had some sound issues. To my big surprise I noticed that I am unable to operate the fuel levers in either the Maddog 2008 and 2010 as well as the Digital Aviation 70/100. In the Maddog, the mouse pointer does turn into a fist when I hover over either fuel lever, but I can't pull it or click it to make it switch position. I didn't have this issue before re-installing everything (formatting the harddrive). I tried loading a partition image I created during install where I only have FS9 and sceneried installed (no aircrafts) and even now it won't budge. FSUIPC can't be the culprit, can it? Any suggestions very much appreciated! I could perhaps survivde without the little Fokker, but the Maddog I NEED to have!