I started to see this same kind of problem after updating my PHP to version 5.3.xx check to see if your website/web host has done a PHP update.
I was able to fix by telling the effected web site to use PHP 5.2.xx check with your web host on how/if you can do this as a test.
I'm hoping some one will be able to adjust this plugin to work with PHP 5.3/5.4
Dave G




