[Dovecot] Error in IMAP command UID

I get this error with some messages in my inbox:

The current command did not succeed. The mailserver responded: Error in IMAP command UID: Invalid BODY[..] parameter: Missing '>' in <102400.-100124>

The <102400.-100124> at the end depends on the message.

Client is Mozilla Thunderbird 0.8 using imaps. Server is Dovecot 1.0-test47.

Is this a bug or did I configure something wrong?

Jan Kuipers Systemadministrator Lauwers College