HI, I'm having some problems with my timeline playback. It was all working fine, playing back at real-time (25fps) until yesterday, when my PC decided to crash. Since then the playback has been really slow and choppy.The animation in earlier scenes of the same project without lighting set-ups etc works fine still but the later ones don't. I thought it might have something to do with the lights but I've tried deleting them and the playback is still bad. Has anyone come across this problem before?