The issue... Using a new profile I added 2 POP accounts. Without making changes to any other settings I set both POP accounts to use Global Inbox. Restart Thunderbird. In Local Folders -> Junk Settings the "Junk" folder on: is blank, any changes made are not saved. Junk mail is not moved anywhere. Possible work around... Change both accounts back to use, Inbox for this server's account, the Local Folders junk folder is set to one of the POP accounts junk folders. Set the Local Folders junk folder to Local Folders. Change both POP accounts to use Global Inbox. So far the setting seems to stay saved and junk mail is moved. I first came across this issue on Windows 7 x86_64 and reproduced on the 2011-06-29 nightly.

Anything in Tools -> Error console ?

(In reply to comment #1) > Anything in Tools -> Error console ? Once the problem has started to occur, when I select Junk Settings under any of the accounts, including Local Folders I get: Error: uncaught exception: unable to find folder to select! I get no error when I click Ok to save the settings.

Do you have the issue if you start Thunderbird in -safe-mode (see http://support.mozillamessaging.com/en-US/kb/Safe-Mode) ?

Yes I have the same issue in safe mode.

Can you check that prefs.js in your profile (see http://support.mozillamessaging.com/en-US/kb/profiles) can be written by your user.

It is writable.

This profile has two dummy POP accounts, it shows the issue described.

similar issues being reported at - http://getsatisfaction.com/mozilla_messaging/topics/junk_settings-10z0q - http://getsatisfaction.com/mozilla_messaging/topics/tbird_3_junk_account_settings_not_saved - Bug 573738 - Option(s) to "do not mark email as junk" if in address book does not remain set (now WFM) ~last fixed bug ... Bug 368617 - Account setting "OK" button not saving data (due to junk settings)

I have this issue not only for junk, but for normal filters, too (can not select an account at all). Is that the same bug or coincidence?

Dupe of Bug 536768?

(In reply to :aceman from comment #10) > Dupe of Bug 536768? I'm going to duplicate. if it's not true we'll file a new bug after 536768 is fixed.

(In reply to Moritz Strübe from comment #9) > I have this issue not only for junk, but for normal filters, too (can not > select an account at all). Is that the same bug or coincidence? What are normal filters for you and where do you select accounts there?