I can also rule out these from your list:
- !!Warmup -- installed after the problem started
- MasterPlan -- disabled on most characters, also LOD so it isn't loaded on login anyway
- OmniCC -- problem still happens when it's disabled
- Recount -- disabled on most characters
- TomTom -- problem still happens when it's disabled
Which leaves only these as the common ones:
- !BugGrabber
- Clique
- Examiner
- Mapster
- Masque
- Molinari
I'll try disabling those tomorrow and see if it still happens. (Really hope it's not !BugGrabber
)