As you can see, there's no buttons (invite, activities, block, etc.).

Just appeared like that (Maybe when I downgraded from 8.1 to 8.0) . I've tried reinstalling (which I would have thought would fix the problem).

ok i found the problem... but because I'm dutch it is a bit hard to explain... but I'll try anyway...

open a convo and click on the menu button (next to minimize) then choose tools(??) --> show toolbars(??) and place a tick at both options. (It is the first one (standard(??)))

hope this helps... if not try to figure it out with the screenshot

Thanks foaly.

Never even knew you could do that