False alarm! By the time I tried re-installing the game I discovered that the CTRL was frozen in that computer. After a re=boot things worked again.

<t> I am in Murfeesboro (Chickamauga) when I tried chain movement for the units. It worked fine in 1 movement phase, but in the next movement phase I couldn't get back to moving individual units. Adjacent units are stuck together. I even tried starting a new game and the chain function is still ...