I had tested that, too (see the edit in the big green post Image may be NSFW.
Clik here to view.) and with a new ume-user (that had just very little permissions) and even a new ldap-user (copy of mine) it worked perfectly. It was just a problem with this particular account and the one of my colleague, too. That's why I was so confused. ^^
But as I said, now it works with both accounts. Image may be NSFW.
Clik here to view.