I keep seeing friends having this problem, and it occurred to me that everyone else might like to know about this too. :) GTK 2.2.4, released maybe a week ago, fixed this bug, so be sure to upgrade, especially if you've encountered this problem.
(In general, you always want the "autosave drafts" option turned on in the LogJam settings. The only reason it's not on by default is privacy concerns, though I don't know how valid those are...)