No, maybe I didn't make myself clear, it is not a MoI problem, probably there is a problem with my graphics card, explorer, direct3d, opengl and every other nice graphics system I can't understand :)

For example, I open MoI, make the same rectangle, now I can choose all 4 sides. If I do this one more, maybe I will be able to select 2 of 4 sides.
I can't blame MoI for this, that's for sure... I just need some advice where to look for the reason of this problem.