Problem goes away in safe mode?

see https://support.mozilla.org/en-US/kb/safe-mode-thunderbird

unfortunately starting in safe mode the problem persists. I have run out of ideas on this one. perhaps version rollback?

thanks

You can get back onto the regular release track by just downloading from here: https://www.mozilla.org/en-US/thunderbird/all/

There are a few tips here, especially the 4th and 5th, that sometimes fix corrupted unified folders.

Thanks all for your help.

still no resolution for this problem which is causing a lot of inconvenience. any other ideas? haven't been able to rectify his for a month now.

thanks

Zenos said

You can get back onto the regular release track by just downloading from here: https://www.mozilla.org/en-US/thunderbird/all/

thanks for this I can only see the beta version on this link and various language versions. the inadvertent upgrade to beta was what caused this problem in the first place. any suggestions of other ways to roll out?

thanks

problem solved with rollback to v 5,0 and deleting smart mailboxes

thanks