Using VASSAL 3.1.17 on OSX 10.7.2:
- place an Axis control marker in, say, Kharkov
- place a soviet control marker in same hex
- save and close game
- reopen save - the Axis control marker is back, Soviet control is gone. Since control markers cannot be selected (and then deleted), the Axis have secured control of the hex in question forever. Now that’s a secret weapon to turn the tide with…
Definitely not a game stopper, but it would be nice to be able to use the control markers properly.