Thread:Project:Support desk/Page Edits or creation not working

Using MW 1.24.0 MySQL 5.0 PHP 5.3.21

I have created a private wiki and added 6 users. The user group has permission to edit and createpage. However when I or a user goes to edit, on the main page, then the edit is not carried out, there is no error and you are returned to the page as it was.

Also adding a page via search doesn't do anything and returns you to teh main page with no error.

Any ideas?