Rhythm/timing issues

Hey all- So I just wanted to see if anybody ever has any rhythm or timing issues in reaper? I am having a boatload full of problems, and I can't figure out why. It just seems that the timing in the program is off when I play my guitar or bass. I don't think it's latency, because the timing can be off before or after, so I just don't know. I seem to have the most problems when I import a beat from fruity loops, then I can't play over it without it messing up. I can record my guitar through my mic fine, but after that my timing just seems to get all crazy. Any help/input would be GREATLY appreciated. Thanks! (PS- Operator error is the first thing that came to my head, but I don't think that's it. I'm pretty brutal, but I lined up a 4/4 beat with my strokes of the guitar and it was still off haha. )

Go to "Project Settings" (Alt Enter) and then project setting again and set timebase for items to "beats (position,length and rate). See if that helps. Good luck

Under Preferences/Audio/Recording, is it possible that your driver reported latency is incorrect. You could check things by doing a loopback test. However, that wouldn't explain why you can get an offset in either direction. Pete

As for doing loop-back testing for measuring the true latency, I've made a JS FX exactly for that. here project included that is (hopefully) runnable out-of-the-box.