Zaac Abrahams

Apologies if this is posted in the wrong place. I'm loving the game so far, it's great fun. I have noticed an issue with placing building items and rotation. However I've read about people being able to place objects at a 45 degree angle, and I can see the other keys in the bindings for rotating, but they don't seem to work for me. Am I doing something wrong? Or is there a bug?