If you have an exchange account sync'ing, I believe that's a blur function, and it's my understanding that that app was removed (drod can probably answer that for sure)...
The only setting I know of that would have any affect on this issue.. is gmail sync' checked:
menu button> Settings> Accounts> your Gmail acct> Sync Gmail (make sure it's checked).
To help troubleshoot... a few questions:
-- During the installation of the ROM, you did format the cache, and data, correct?
-- Have you restored data from backup (backup pro, or titanium)? If so, you probably restored this problem along with it.
--Since installing the ROM, what else have you installed/changed/configured (IE: themes, etc.)
Hope this helps, GL!