Working on a MBP (Intel) 2.16 with 2 GB of RAM and OS 10.4.7:
I get a repeatable crash whenever I Save or Save As... right after the operation is completed.
Good news is the data is all there and can be loaded, so nothing is lost except some time restarting the program. This happens every time for me.
(Both my bugs this evening are with the prerelease 6.3.5.6 UB version.)
-gm