deepsmile,
Check your system against the "Pro Tools (Mac) FAQ #1. What are the optimum settings for Pro Tools on a Mac?"
http://www.digidesign.com/support/faq/ptmac.html
Pay special attention to the Memory Control Panel/Disk Cache settings. A high disk cache setting has been known to cause problems with Bounce to Disk.
Ignore the Digidesign extensions in the list of guidelines that are not installed by Pro Tools FREE that might only apply to LE or TDM systems.
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Bruce Paine
Digidesign