Ch Throttle Very Jumpy In Q400

I'm having some difficulties with my CH throttle quadrant. It works fine for every other aircraft, only with the Q400 it's not.
At first I had it set up through FSUIPC, but I had a very large spacing at the bottom and very small spacing at the top, although the throttle were steady.
To give me some more space at the top end, I removed the FSUIPC controls to have a look at the Q400 own control panel, but when I opened it, I noticed that everything on that page is flickering, the graphics, the text, everything. And when I use my throttles through there, the throttles in the VC just jump up and down. I can steady them by hand, but once I let them go again, the levers start jumping uncontrollably.
So I thought I might had done something wrong with the installation of the drivers, so I removed those and checked the Q400 throttle control page without the CH connected, or the drivers installed, but still that page is flickering.
Reinstalling the driver didnt give me a different result, so I'm a bit stuck here...
 

Can anyone advise me on how to fix this problem?