I have a headache.
On none of the sites created by my studetns can I leave comments, if I click "Leave Comment" it goes to the post page but no comment box appears.
But if I make one using my own account or the administrator account everything works fine.
They are all using either the 2010/2011 theme and all the settings are the same as when I create blogs.
I tried moving and renaming the comments.php file in the theme folder as I saw on a few others but it didn't help. I can't even find much of a pattern other than it doesn't work for them.
I have only a few plug ins installed and they were all fine until recently and I don't think I've even done any updates in the last few weeks or months that would suddenly cause this to happen.
Any help greatly appreciated.