I really tried hard to think I missed stg with Breakthroughs, but I now believe stg is .. broken

In all battles I played , in Serbia and Tannenberg scenarios (playing Central - I still didn't tackle the big campaigns), I never could select any regions in the breakthrough subscreen... Everything seems in order, but no amount of clicking select anything. The only time it worked was for the tutorial (but you lose the fight !)
I have checked that I was attacker, had reserves, I think weather was fine (Aug 14..), what did I miss ??
