Something really weird just started happening and I can't figure it out.
When I play a sequence in the timeline, what I see in the canvas isn't in sync visually. It's just a bit behind. The audio is in sync, but the video lags. I've been using FCP on this computer for a few years and never had this problem.
Don't think anything else has changed. I am using videos with different frame rates. I've done that before though and not had any problems. Plus I tried converting them all to 29.97 like the sequence and it didn't help.