I've just been teaching an aircraft company, Inventor, and the following has reared its ugly head again.
When you rotate a UCS to re-align it, the position rotation is the wrong way round.
Using the "right-hand corkscrew" method to determine positive rotation ie rotaing around z-axis, x move towards y for a positive roation. (just like in Autocad by the way).
When are Adesk going to change this?