For some reason, when a moderator runs the spam cleaner on my site, they receive a server error, but it apparently does complete all the spam cleaning. I dont seem to have this problems with admins though. Any idea what could be wrong?
Are you able to reproduce the error yourself (when logged in as a mod)? If you can reproduce it yourself then try enabling debug mode while reproducing the error. It should reveal a more detailed error message.
You can enable debug mode by adding this line to your library/config.php file: