Chain of events:
I moved the two new units from the city to my Sov. I then selected my Sov army (now consisting of three units) selecting 1 of the units on the end I then right clicked on the units on the map, the unit selected vanishes. This is repeatable (until you run out of units)
in short, moving a unit to an army he is allready in makes him devide by zero and get sucked into a black hole.
