Banned User update - now getting a php error

I was updating the list of banned user emails. After I selected update, my screen went blank. I have tried/googled everything I could think. I was able to set the debug, but I still cannot find my solution. My website is http://www.planpreparereact.uga.edu/. I am using EE v2.5.2. Here are the features for my webhosting: Apache 2.2.3 Perl 5.8.8 CGI Python 2.4.3 CGI PHP 5.3.3 running in FastCGI mode Virtual Hosting sqlite 3.3.6 MySQL 5.0.77

Any help would be much appreciated.