Mailbox collect failed

Hi,

First thanks for the work, the beta2 works very well on 4.4.
I have a weird issue; i'm connecting to a google apps mailbox to collect mail.
Bounce mail are collected in my mailbox, i can see them on the webmail. They are sent through cjw_newsletter.
When i click on "collect all mails", it connects OK to the ssl gmail mailbox, but mails are not added to the mail list, i get "Failed : 2" as mailbox collect result.

Logs aren't clear on what is happening, do you have any clue on what i can look on to find a solution on getting those mail in the list?
I made this work once on the previous version, but i can't see why this do not work.

Params for the mailbox :
email : newsletter@domain.com
serveur : imap.gmail.com
Port: 993
User : newsletter@domain.com
Password : *****
Type : imap
SSL : true
Delete : false
Active : true

php 5.2.10-2ubuntu6.5
Apache/2.2.12 (Ubuntu)


Thanks in advance