to reproduce:
0) load image with non-isotropic spacing
- rotate crosshair (not 45 degree angle)
- click position and displayed crosshair do not match
- effect is more visible further away from planes
effect is also present in 3D when using point set interactor.
since it does not occur on 1,1,1 spacing images we think it is related to the spacing somehow.
is only present after last realease (2014-10)