I just entered Bugzilla bug #147, which can lead to data loss if you:
1. Save a project in window 1
2. Select all and copy
3. Open window 2, then close window 1
4. Create a new track in window 2 and then paste
5. Select something small and copy.
Poof - all of the blockfiles from the original saved project are
deleted because the clipboard derefernced them and they had lost
all ties to the old project.
There's a quick fix which will eliminate data loss but could lead
to a (disk) memory leak, and a harder fix which would eliminate
the problem. I might favor the quick fix for 1.2.1 and the correct
fix for the CVS HEAD, depending...