Aperture hangs upon quitting
It doesn't happen all of the time, but often enough to make me want to post an inquiry here. I can't pinpoint a reason, but upon quitting, Aperture starts to go through its saving and updating preview process, but never completes it. The progress bar makes it a portion of the way and everything appears to be running still, but it never finishes. I've even let the process run over night, but in the moring it is still in the same spot. I have to manually force the application to quit. It tells me that all of my edits will be lost, but upon opening the application the next time, that doesn't seem to be the case. Still, having to force quit is a bit unnerving, especially when I have to do it consistently. Is there any data on this problem? What could be causing this?
Macbook Pro 17, Mac OS X (10.6.7), 2.93 GHz Intel Core 2 Duo, 4 GB 1067 MHz DDR3