[Phanx]

All of the older crash logs are more or less identical to the one I posted, and none of them have Realm, Local Player/Zone, Total Lua memory, or Current addon X lines.

I'm currently logging in, waiting for someone to spam me with a guild invite, and then logging out. So far I've (probably) established, by testing 10 logouts without guild invites and then 10 logouts with guild invites, that:

1) No crashes occur when all addons are disabled.

2) Alt-tabbing at any time has no effect on whether a crash will occur, as I have alt-tabbed at least once before each logout.

3) None of my class-specific addons are causing the crashes, as I am currently testing on a druid, do not have any druid-specific addons, and have crashed.

4) No crashes occur when only addons A-L are enabled, regardless of whether I have received a guild invite. This includes LearningAid, so it is (probably) not the cause of my crashes.