Umm well I just reinstalled the game on a new PC and got a second liscense without playing the demo.

Hmm I just tested with a cube of subdivision 4 and 8 and the new prism-expanded truncated cuboctahedron at subdiv 4, all clicks on the cubes were registered to a field on the back of the cube ...

Hmmm I seem to be having a similar problem in version 2.5.1, my clicks do register, but on the wrong side of the objects. So far it has affected all of the ones I've tried to play.