I have been running IMAP from my MAC devices about 3 years now and last week I changes my server from OES2 with NSS as base for my GW to pure SLES 11 64 bit with ext3

Now I notice a very strange error with IMAP from my ipone and ipad
New mails flash shortly in the mail app, but then disapears strait away or after I choose to view it.

There is no particular order they disapear just randomly

What can be causing this and how to troubleshoot.

I have even tried to change from GWIA imap to POA imap but the behaviour is the same.
When moving from the old server I upgraded to 8.0.2 from 8.0.0

IMAp from MAC mail functions perfectly just the IOS 4 devices after the move/upgrade