Hmm that is strange. Glad you got it working not sure how enotify messed that part up though.
it was really weird,
But what i instinctly thought that the problem was with a php file that was bad written (sorry my bad english), i guessed it was enotify , but it could be any mod that came up and wrote the index.php, the managesettings.php and the querystrings.php ,
because when i tried to uninstall enotify, the system indicated that those three php came up with an uninstall error so i edited them, then uninstalled the mod (i didnt used it anymore because it demands to much bandwith) ... anyways , the importan thing is that now i have videos again.