This happens on my default b734 and POSKY's CRJ-200ER, both my favorite aircraft.

I start the flight, perform prechecks, blah blah down the checklist.  I get to the autopilot where it says for me to input the altitude I was cleared/filed for.  No problem, right?    WRONG

Let's say the altitude the alt readout on the autopilot was reading 2700.  If I filed for FL290, I'd have to bring it up to 29000.  SImple enough, however, when after a few clicks of the mouse, the increments with each click grow to 1000 each! Now the hundreds place is stuck at some odd multiple of 100, and the thousands are growing with every click!  With each roll of the mouse scroll the altitude goes up by 2000! I can't select 2500 unless it gets STUCK at 500!

This happens on my hdg, crs, and spd autopilot gauges as well.  The HDG CRS and SPD all act the same, increasing only in increments of 10, and not by 1.

This "increment" problem would happen spontaneously too, on and off, happening more "on" then "off".  I'd have to tell the controller, "sorry, i can't descend to 3200 because it was stuck at the 600.  Then i would click around and it would decrease to 100, then remain at 100 with every click...

Now, I've learned to live with this for the past few months, but I've hit my threshold in dealing with it and trying to figure it out...

I need saving...  Anyone solving this problem will gain my complete admiration and respect..

It was Tipster who solved this problem for me just a few posts back....!

Press ALT, click the Modules > FSUIPC option, and then to go to the "Technical" tab. Click "Fix control acceleration" (I think it's that, not sure) and your problem should ideally be all gone!