After frustration I learned this: Cubase: suddenly my exports were massively fkd up. The answer, latency buffer was too high, completly screwed up the mixdown. I never would have thought.

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Rave skies are going to gear up, put on that nappy face :,
I'm new, so advise if you got some: http://www.soundclick.com/greenskymusic

Glad you solved the problem. I just solved a similar problem. My sonar was making poping sounds when navigating projects and playing back. I just thought it was a latency issue, so I moved the latency all the way up and turned on caching. That didn't solve it.

After a couple weeks of fustration I finally solved it by turning off the on-board sound card in the system bios along with the other hardware I don't use (parallel port and serial ports). That cleared it right up. Now I just need to turn my latency back down!