It is more likely that the problem is with existing projects and the upgrades rather than QT 7 alone. This is only a guess. I imagine if you start a new project with QT 7 and FCP 4.5 in Panther it will work fine. I am only imagining things. I am using FCP 4.5 with QT 6.5.2 and Panther 10.3.9 to get 3ivx two pass encodes for the web to work properly. So I can relate to your consternation. With Tiger and QT 7 the 3ivx two pass encode yields huge file sizes. The moving target of OS changes and developer followings is always frustrating isn't it? 3ivx says that because of Core Video and QT 7 changes they don't know when they will get the two pass encode working right. So I just set up an old system and QT as my work around - have Tiger and 7 (required in Tiger) of course. Still looking for a non H.264 alternate encode I can use in Tiger and QT 7 for webcast level quality that won't collapse when you zoom in or blow up the 320 x 240 image. I've resorted to one frame per second for some of my longer pieces. Not sure the fast start works in the Panther QT 6.5.2 two pass encode. So I may wind up giving up on this way soon. BTW you all see the new Canon XL H1 HDV Camcorder for $8,999 in November? Boy that is one sweet machine. Canon glass. Oh yeah... -- Taylor Barcroft New Media Publisher, Editor, Video Journalist, Webcaster, Futurecaster Santa Cruz CA, Beach of the Silicon Valley URL http://FutureMedia.org RSS http://feeds.feedburner.com/FutureMedia iTunes http://tinyurl.com/8ql87 barcroft (gizmo) kungax (Skype) kungag5 (iChat-AIM) On Sep 17, 2005, at 4:29 PM, Derek Roff wrote: > We have Final Cut Pro HD (4.5), on a G5 PowerMac 1.8 GHz dual, > running OS 10.3.9. We upgraded to QuickTime 7 Pro (a new code > number is required, which we paid for). Most of our Final Cut > projects wouldn't open properly, and several of them caused Final > Cut to crash while opening the project. > > We downgraded to QuickTime 6 Pro, and all our projects work again. > There is a downgrade installer on the Apple web site, apparently > due to this or other problems. I don't know the details and > causes, but our experience is that QuickTime 7 Pro and Final Cut > Pro HD have serious incompatibilities. Or perhaps the > incompatibility is between QT7 and Panther. In any case, it didn't > work for us. > > Derek >