Since upgrading to Thunderbird 3.0.2 on Mac OS X 10.6, Thunderbird will intermittently stop checking for messages automatically. Frequently I am presented with the error "This folder is being processed" when manually checking for mail.
Restarting Thunderbird fixes the problem, but I have noticed hours can go by where auto checking isn't working, and restarting shows there were dozens of messages waiting to be delivered in that down time.
Occasionally I will see "indexing 1 of 2 messages - 0% complete" in the status bar, it will sit there for a long time.
Actions I've taken to fix:
Deleted all .msf files in all accounts
Removed News & Blogs account
Staggered the "automatically check for mail" interval for each account
Worth noting: after waking up the macbook, TB usually needs to be restarted to resume auto checking for mail.
Has anyone experienced such trouble?