[Dovecot] Problem with folder not showing content

Hi,

I'm having some problems with one of my IMAP folders in thunderbird. When creating a new account in thunderbird and importing from my dovecot test51 installation, using maildir - all folders work fine, except one which does not list it's content when I click it

When I look on the server, I see all the mails inside the folder, but once I click the folder and ask thunderbird to download the messages - it just doesn't display any mails in it.

Is there any way to repair this?

-- Tom