Heroes 6 - Discussion

I encountered an unpleasant bug after the 1.7.1 patch was released.
I'm playing the 4th scenario of the campaign for the Haven faction. My main hero has Tactics II developed. When attacking an Inferno castle, I can't deploy large creatures on the battlefield. When I try to place them somewhere, they don't appear on the field, but appear at the bottom in the panel, as if I had removed them from the battlefield. Has anyone else noticed this?