I've run into a similar issue; When clicking "view entries" on Major Battle info and rules pages, nothing has opened up for about a week or two now. Could something have broke'd it?
I was in the middle of fixing this last night but didn't finish. I killed the 404 error, but was a little too busy watching movies to fix it all the way. This is one of those "we need to standardize the ajax templating system" situations.