I think i've got a problem with Ereg_replace() in the sapphire/widget/Widget.php
I moved my site from hosting A to B when the errors occured..
php is version 5.2, but i think it might be a virtual 5.2, since 5.3 is installed on the server but with a htaccess option i set it to 5.2..
Please see: http://www.silverstripe.org/dataobjectmanager-module-forum/show/16082