Hello, I have already called and spent a ton of time on the phone with apple and even had them run dianostics on my mac pro for an issue that seems to be rooted in FCP. We have 5 macs (one mac pro, a macbook pro, and 3 21.5 inch imacs) These are used to edit short video bulletins for a school. Problem is that anytime a student uses the mac pro to edit on and needs to share the work with someone working on another computer if they use the export then quicktime option the mov file that is created can only be used by the mac pro. If moved to anyone of the other computers it says there is a sequence missing and can not play back correctly. The only way we can then share is to take the mov file to imovie on the mac pro and turn it into a m4v file. Seems stupid and a waste of time to continue to do these extra steps on such a powerful machine (it is a 2009 model purchased last June, 8 core 2.66 12gb of ram all purchased directly from apple). Any ideas about what may be wrong or ways of fixing this problem? Thanks in advance for all your help.