I’ll also chime in here:
It’s not just long GOP. It’s a project size issue. Whether you’re editing dvcproHD, XDCAM, whatever, we found that the bigger the .fcp file the more frequent your crashes will be. Having lots of RAM won’t solve the issue, since FCP is a 32bit application and will only use/see about 3.5GB of RAM.
We found while editing dvcproHD footage we could get to about 50MB projects before crashes started to occur. Projects that were 100MB in size crashed so often that they were not usable. In between the 50-100 size there was generally a linear correlation of stability/size.
The tollerance for long GOP projects is worse, but I can’t say for certain how much worse. Either way, any project less than 50MB shouldn’t be of any huge concern.
How will Apple fix this? A 64bit re-write will not completely solve, but should help increase the threashold. The issue is somewhat unavoidable due to the nature of how fcp stores its information. Looking at the new Premiere CS5 (which shares much of the same project architecture) we can see that the 64bit code does indeed allow bigger projects that don’t crash. We should hope that the same will apply to FCP.