Logic Pro 9 Loud sawtooth squeal when mixing

Halvor

Logician
UPDATE: FIXED. Faulty 3rd party plugin caused it.

Hi.

Im using logic 9 and the apogee duet, Imac 3,2 i3 and 4gb Ram.
When Im mixing I get a loud sawtooth sounding squeal. I have to close the project and reopen, but the sound comes again after a while.

Anyone know what this problem is?
Thanks!
 
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