Cracking and extreme noise in LE 7

[atomicwave]

Alright, this problem seems to be caused because of the digirack limiter plug in. Sometimes... not always... I'll throw a limiter on a track, and the whole track will be noisy and distorted, and i'm unable to use the limiter. But also, if I make a new session, sometimes the limiter will work. However, sometimes.. if I close pro tools and reopen it, my speakers shoot out ear piercing terrible distortion. Fuzz, ringing, you name it. The problem seems to be getting more and more persistent. Any clues?