Unfortunately, it still does it for me. I've tried this suggestion, and the earlier one about deleting the trash.msf files, and neither seem to have made any difference at all.
I've tried a few more things now, such as deleting my huge bookmarks file, and severely reducing the number of newsgroups, and it now seems that newsgroups may have some bearing on the problem, at least in my case.
I deleted most of my newsgroups, but with no noticeable difference. I then went into the settings, and turned off "check for new messages at startup" and "Check for new messages every". The idea was to try to stop SeaMonkey from doing anything with newsgroups without me needing to actually delete everything, which I didn't want to do.
I noticed that the "To recover disk space" options were set to "Don't delete any messages". I changed this to "Delete messages more than 14 days old" and set the "Remove bodies from messages more than" also to 14 days.
Eureka - I can now use SeaMonkey again on this computer! It still hangs sometimes, but nowhere near the literally "four minutes out of every five" level that it did before.
This information, together with the previously posted information about possible links to email and .MSF files, strongly suggests (to me, anyway) where the problem lies. Seamonkey never used to behave like this, so any "background" (hmm) cleanup routines that have changed in recent versions are clearly suspects.
I'm sure those of us suffering this hanging problem would appreciate it if some development time could go into nailing this bug.
Regards, Peter _______________________________________________ support-seamonkey mailing list [email protected] https://lists.mozilla.org/listinfo/support-seamonkey

