CS 5.5 Crashes on 2010 Macbook Pro

Question

I've got a 2010 Macbook Pro with 8GB RAM and an nVidia card. CS5 worked great on it, but CS5.5 is a different story. I can create projects, import footage, save, and reopen, but when I add a few items to the timeline, save, and close the project or program, the problems begin. Premiere crashes every time I attempt to reopen the project. I've tried using different drives, different types of footage, logging in as administrator, and a complete reinstall. No success.
I informed Adobe tech support of the problem and uploaded crash logs from the program and OS X for them to view. The really annoying thing is that they've promised twice to call me back in a few days after bumping up the problem to a higher level of tech support, but failed to do so.
Any ideas? I'm still able to use CS5 on this machine but it's extremely annoying that 5.5 is completely useless to me.

Answer 1

MacBook Pro (2009) 3GHz, Intel Core 2 Duo, 8 GB with 256 SSD internal, Lion 10.7.2 (pretty high end mac laptop).  External drives are G-SAFE, SSD 256, Promise SmartStore, etc... all sorts of variations with FW800.  Thought it was external media drive issues at first, bt b een testing and narrowing down for several days.  SImplified it down to no external drives and two small media QT files on my internal drive (SSD) and still crashes often.  Premiere will launch and crach within a few seconds while trying to link files (so it looks like).  In the project window, the icons for the media files will change to video, movie icon etc.. when all is fine and the app stays up.  I can tell when it is about to crash when the app launches and the media file icons remain unknown for several seconds then it seems to time out and crash within a few seconds.  All I do is try to bring up the project again and it will either do the same or launch successfully.  no rhyme or reason.  sometimes it works sometimes it crashes.  i just keep trying until it launches and media files link... then all is fine and I can edit.  VERY frustrating and makes me not at all confident about the product.  But, I realize it is something very strange and probably system-specific related.  Can't imagine this is a normal problem with Premiere.  Just feel its like a needle in a haystack.  I tried reinstalling Lion, clearing cache, etc... with Adobe tech.  just don;t know where to go from here/??  Thanks again for your comments.