I'm running Thunderbird 24.2.0 on Kubuntu 13.10. When I first start the app, everything works OK: I can delete individual email items (Delete key, "Delete" button, or right-click context menu option) or move them from the Inbox to various folders.
After some period of time, all that functionality just stops working: no error messages, just cannot move/delete individual emails. It still gets new mail and I can still read email. To resolve the problem,I have to stop/restart Thunderbird.
Any suggestions on what to look for? A google search turned up a number of similar issues, but they were all dated back in 2009 for a much earlier version of T'Bird.
I've removed and re-installed T//bird; I've chown'ed all the files in the ~/.thunderbird folder to my id:group; I've run it with sudo -- nothing solves the problem: it starts out working just fine and then eventually is unable to delete or move messages... or even save into the Sent folder. I'm about ready to look for another email program.
Update And now, thunderbird has forgotten all my settings, accounts, etc. My default directory is still there but not recognized. My postings to bugzilla ticket #784267 along with a number of other folks continue unanswered. What a mess.