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I'm honestly a bit apprehensive of just deleting everything in that folder. I did remove the OSS/3D plugin that I never used, but there's a couple other plugins in there that seem a bit too important to just delete. Any other solutions? You don't have to delete them. You can just move them out one ...

By the way, just for the record.... I have now had three reports of users for whom Amadeus Pro wouldn't launch after they upgraded to Snow Leopard. The culprit always was a third-party audio driver that wouldn't work properly. If you experience a similar problem, have a look at your /Library/Audio/...