On this blog, running Atahualpa and some well-working plugins, when I try to add a page, a category or a custom link to a menu, I am thrown out to the login page. No error message. Acessing the admin from another tab shows I am actually logged out.
I also created a brand new menu and all worked up to I got to the 15th item, vene this was not the same item as the original menu. Is there something magical about 15 or 16 when it comes to menu items, some practical or applied limit of any kind?
I know I can investigate this by disabling all plugins and use Twenty Ten. At the moment this is not an option, so I will have to set up a test site later.
In the meantime, do anybody have a clue to what may cause this behaviour?