I have been using ssl for about 6 months HEAVY! Recently I have been getting some unusual things. For the past 2 weeks I have been having a problem with the right side. When I go to play the track, it starts glitching/stuttering. I tried different needles, control records, as well as turntables! last night I set up at my house to start troubleshooting, now its doing it on the left side! It is really scaring me because i have a full weekend of gigs coming up. Even when i go into internal mode, it freaks out! I'm using 1.5, no external hd, no usb hub, with a powerbook G4. Please help me guys!

How does the circle for the right turntable look? Could be a grounding issue, but that wouldn't affect internal mode.

I would suggest calibrating your setup. It definitely sounds like an interference issue.
If you switched from abs or rel to int mode while playing a track, you will still get interference until you unload the current track and load it again.