Can't edit object properties with context menu + right click

For some reason recently I can’t edit the properties of objects like “edit bones”, “drive” etc. by c+right click. If I try to right click on an object, no menu shows up, it doesn’t give any indication that I’m hovering over a prop. Anyone know how to fix this?

You must in sandbox or sandbox derived gamemode for that, and your admin mod must not block it.

This is in singleplayer


[editline]18th November 2014[/editline]

well not me a friend lol