Possible solutions:* Disable online at insertion point record and Quickpunch. * Enable Mute Frees Voice. * If using ATTO card, be sure Drive and Bus sync rates are set to 20 (10) and not 40 (20) by using Express Pro Tools software from ATTO.* Disable all ATI extensions in extensions manager, USB Iomega (if not being used). * In Appearance CP do not use Charcoal for large system font, and turn off font smoothing, also disable Platinum Sounds. * Check to see the application memory minimum has not been changed from factory default. * Quit PT, highlight the application icon, get info (command-I) and go to memory settings. * Highlight the number in the minimum field, type zero and hit return. Do the same for DAE and Pro Tools,