v 31.0 Lately, I've been missing sub-folders. I sync to Gmail -- all mail & folders are visible in Gmail, but folders are missing in Thunderbird. My temporary fix is as follows: 1, Click the top email address 2. Click manage Folder subscriptions 3. Click refresh Sometimes this fixes the issue, sometimes not. And, it's not always the same folders. Currently, I'm missing 15 sub-folders. By the way, this might be helpful... Recently replaced the drive on iMac, restored from Time Machine... Also, performed a 'disk erase', Mac's function for cleaning-up deleted files. wondering if Thunderbird was impacted. Although, everything else on the iMac runs perfectly. Thanks!