cannot add or modify contacts since moving to 7.0.30242.0

Hi,
Everything used to work fine but since I moved to 7.0.30242.0 the following happens:

If I modify a contact it is deleted from EMclient but the modification is correctly done on my bell.net mail server.
 If I create a new contact, it shows in bell.net but not in in EMclient. In fact it shows in EM client for a fraction of a second and then dissapears.
I am using IMAP and have no problem with the mail.

Please help me!