The project file is not big at all. I’m working with .mov files converted from .MTS files from my Canon Vixia HF M40. I used clipwrap to convert them. The clips are on average about 25MB each, about 20 clips. NO third party filters. I’ve used FCP for other projects just fine in the past, but for some reason, it seems to not like this project. I’m usually messing around on the timeline, lengthening or shortening clips when it quits. Once I was working with the viewer, fast forwarding a clip and it quit. The time frame kept getting shorter and shorter. I’d be able to get in maybe 15 minutes before it quit, then it was down to about 10 then 5. I tried a new timeline AND a new project… nothing seemed to work. That’s when I decided maybe it was the preferences… once I finally found the files I deleted them, then opened up FCP again.. same problem.