[Dovecot] problem with thunderbird

Hi all, I've a problem with thunderbird 1.0.6/7/1.5 and dovecot pop3

I've tried dovecot alpha 3 and 1.0 stable but neither one is capable of downloading mails.

Nothing is written into the log.

I've tried also to delete dovecot.index* and dovecot-uidlist into the Maildir directory.

The cur directory contains more than 8100 messages (single files)

Anyone has founded this problem?

Alfonso