I started defining a combat by selecting unit 1 (see picture) then target unit then added in units 2 and 3 which gave me odds of 4:1. I then decided to reinforce unit 3 to see if I could get better odds next turn but I neglected to cancel the combat first. When I pressed "L" I got the reinforcement I wanted but now I can't select any other German unit to attack them - the combat screen for the old combat won't go away. I can select other USSR units but I can't move them.
I can recreate the problem.
Note that problem only occurs if the reinforced unit actually needs more troops.
