Note that this is a patch for ProofBuddy 2.0 and 2.1, not for the current 3.0 WordPress plugin version of ProofBuddy.
This patch is for cases where your host has upgraded to PHP 5.4. What you will notice is an error message mentioning ob_start and displayPage. Click on the download link below and on the next page you will select whether you need the patch for ProofBuddy 2.0 or ProofBuddy 2.1. Instructions are included in a readme.txt file inside the download.
If you don’t remember what version of ProofBuddy you’re using, tabs on the admin side were across the top for ProofBuddy 2.0 and down the left side in ProofBuddy 2.1. You can also view the readme.txt file from off of your server.