"Retrieving account information"

Hi.

We hit this problem with the last ZxMobile (on a brand new 8.0.7 server), with one customer using a Galaxy Note 2.

This customer can receive (push) emails or calendar items but can not create any (ie: not even send an email).
When he wants to send an email, the email client display "Retrieving account information" and that's all...

I enabled the account log for hit user but did not really see anything interesting in it.

However, this is an account migrated from NE (same email, same domain, only the server changed) and it was working on NE (for the last 2 years up to 8.0.6).

Any idea?