I'm a little hesitant to post this because I haven't tried it since, but one time when I went to save a last recording, and I clicked on "Save last replay" and then named it . (just .), my whole recordings folder got wiped. I'm still on mac os 9.2, and come to think of it I can't remember whether this happened on the beta or 1.4.3.
In conclusion: not a pressing matter, but maybe worth a glance.
When I played a game, finished it, got out of multi and went to save last film, I named the film "." (just .), saved it, and then all of the films go away!!