I posted this already on Apple Discussions, but just in case there's no overlap...(plus I can distill the few answers I got into it) For some strange reason, during the last few weeks we've been having a lot of problems exporting projects by playing them via canvas or through 'print to video.' The projects range in size from 8 minutes to 30 minutes. They will play fine on one pass, but then another one will have a stutter. The stutter doesn't occur in the same place each time. Doubt that the problem lies in the connections outside of the computer (it's going via firewire to a Sony DVCam Digital Videocassette recorder DSR-45, then to a mixing board and to DVD recorder or Beta deck), since the stutter appears on the computer screen (it sometimes is a few frames of black or gray or even a red 'not rendered/media not connected' type screen). The drive being used is internal (one of two 400GB hard drives, each of which has about 100GB free). It doesn't matter if the project files are on the boot drive or the other internal drive (used only for video storage). The material is all shot on the same Sony DVCAMs. It's listed as DV/DVCPRO-NTSC 29.97FPS. Only difference I see in sequence as compared to master clips in terms of browser settings is in audio format (master listed as 16-integer as aud format versus 32-bit floating point in sequence) I've Disc Warriored and Disc Utilitied the computer. It's a Dual 2.6 GHz PowerPC G5 with 4.5 GB of RAM running 10.4.11 and the latest upgrades of Final Cut Studio. Can't think of anything that has changed recently (only thing is updating the FCS2 files...which did happen right around the time when the problems started, come to think about it) Any suggestions would be appreciated. The two I received at Apple Discussion seem very...last ditch draconian. One was that I needed to use an external drive for all video work instead of the internal secondary one (possibly a problem with the model of computer we are using). The other was that the newest version of Quicktime could be causing the problems and that I would have to wipe the system and reinstall everything. Thanks for help!