Wow, ironic you ask this question in this thread on this day as I just happened upon this thread today. I have the same camera and have been searching for a solution to this issue. The problem is that, I believe, you're trying to import a clip that was shot in 60p. FCE doesn't like 60p. If there are clips on your cam shot at this frame rate the app will crash and burn every time you open log and transfer.
I had this problem in lion and mountain lion as well.
I was able to find two solutions: 1) Shoot at 60i. 2) Use an MTS Converter app. I downloaded one called Pavtube that seems to work well. Might give that a try.
The only thing I'm unsure about at this point is that FCE has sequence settings for 60i but not full 1080 at 60p. I imported a clip I converted with Pavtube into a sequence set to 180 60i and it seemed to work fine. I get a message saying the file I'm importing isn't optimized for FCE but as far as I can ascertain that basically means the clip wasn't transferred and converted using FCE. I don't think it presents a problem.
Do you know if this camcorder has a setting for 30 (well, technically 29.97) FPS? As that's pretty much the standard, might make sense to shoot at that rate, if possible, and avoid downconverting after/upon import. I just don't know if our cam will shoot at that frame rate. Any idea?