After creating category and saving i'm redirected to a 404 page

After creating a category i’m redirected to a 404 page. Same when I try to edit a quick links URL, as well as save most other settings in the admin area. My permissions are correct and this is a default install of the latest CS-Cart version. What can I check as far as settings on the server to see what could be causing this. I’m clearly able to access my admin.php login move around but can’t save most settings.



Thanks