Question: What exactly do you do to repair?
Do you select the repair skill and right-click the item?
Or, do you select the repair skill, right-click to activate the skill, then left-click the item?

I remember having problems with this because I couldn't co-ordinate my clicks! Larian, if you hear this, can you please make RiftRunner so that you just need to right-click the item (like my first example)?