It may be that the install for Canoma and Carrara have overwritten your previous versions of OpenGL/Quicktime & Quickdraw3D with newer/older extensions that are not compatible. The "latest version is not always the best version for some apps. Have you checked the Macfixit site for any info? Does this problem happen if you "render to disk" and/or to screen? See info about "sleep mode" below & try that or search this site for possibilities: http://www.macfixit.com/reports/g4.shtml Power Mac G4 (AGP Graphics) wake-from-sleep problem: According to a new Apple TIL article (#58451): "When the Power Mac G4 (AGP Graphics) enters sleep mode with a single channel PCI SCSI card installed, the computer may incorrectly assume the card supports PCI power down mode and not wake properly from sleep. The only workaround is to disable system sleep in the Energy Saver control panel. This issue will be fixed..........