UNDO problem captured in log file

Hi,

We are playing a game of It Never Snows. This is about our 3rd game. My friend was recording his move when about halfway through he had to use the UNDO button a few times to return some pieces to an earlier location. Some problem occurred (glitch?) and when we play back to the log file, a bunch of pieces end up in a big stack in one hex and the pieces he saw clustered around my pieces making attacks are not there. Funny thing is, if we play the log file forward and then try to “UNDO” after the UNDO steps have been played back, the pieces will NOT return to their original place. The log file is obviously mucked up from this point and cannot be rewound.

I’ve attached a copy of the log file. My friend is using the latest copy of Vassal.

Kind regards,
Scott