Well, if you have installed CB 1.2.1 on a PHP 5.3+ environment, then you will run into problems.
Current solutions (all posted in these forums):
+ downgrade if possible to 5.2.X version of PHP
+ wait for CB 1.2.2 (no ETA yet)
+ try applying fixed posted in forums (search - don't have exact forum location handy)
Hope this helps.