Tenfourbird

May be this bug is related to global indexing. But I need more details to solve your problem. such as:

• OS version
• CPU info
• Memory size
• How many mails do you have? (100?, 10,000?)
• How bug is occured? (at startup?, how often?, any trigger event? etc...)

If you want to stop global indexing, there are two procedures:

1. From Preferences

1. Advanced Tab > Uncheck Enable Global Search and Indexer
2. Restart Tenfourbird

2. put user.js on profile dir

1. Quit Tenfourbird
2. Create file user.js on dir /Users/[your home dir]/Library/Thunderbird/Profiles/[random letters]/
3. Copy following line to user.js

    user_pref("mailnews.database.global.indexer.enabled", false);

4. Start Tenfourbird

Regards.