Forum 500 Internal Server Error's when trying to edits templates
 

Since upgrading to vb4 I have run into a problem of these "500 Internal Server Errors". Specifically, I get these when trying to modify some (not all) templates. The latest example is when I try to make a change to the navbar but get this error. Also get the same error when trying to change a variable in a plugin. Any thoughts as to what is going on?