Buzz Sound plus all the Meters in the Red

I'm running PT10 on 27" iMac with a Digi 002. My hard drive is a Glyph GT050Q. I finished recording a guitar track and inserted IK's White 2A Leveling Amplifier on the track and all of sudden I get a loud buzzing sound and all the meters go into red across the board including the Cue mix. When I hit play it goes away and comes back when I pause. I turned everything off. Waited and loaded a different session. Same thing. I turned everything off. I loaded PT and created a new session named it "Buzz Test" No buzz everything is fine. Did a line check with a mic and got a signal. No prob. Save the session. Opened up the previous session I was working on and got the Buzz in pause/fmeters in Red. Opened up a different session from before. Same thing. It seems a new session is fine but any previous saved session suffers this buzz/meters going into the red across the board. What's going on? I'm really nervous.