Comment 8 for bug 1065780

I think this is less of a hugin problem but a good reason for a system check. I prefer http://applejack.sf.net (which starts fsck and a few more tests) for that, but an OS X startup DVD with Disk Utility (see http://support.apple.com/kb/TS1417 ) will be a good start.

From the first report "It seems to hapen more often when other programs are open in the background." In that case I'd close all other apps and have an eye on the activity monitor.

About "cursor is a watch", isn't it a "spinning beach ball"?

You wrote that you "didn't change any prefs." Please read the READMEs that come with the software, there are indeed some prefs you should adapt to your needs...