v3.2.17: Can put a maximum of 1 piece on board

This is my first time using this version of Vassal. No matter what game I play, I can’t place more than one piece on the board; on some games I can’t even place one! Anyone know what I’m doing wrong, and maybe I’m missing a simple fix?

Thanks in advance.

Back again.

I resolved the problem. I was using an outdated Java Runtime Environment. Updating it resolved the glitch, to help anyone who encounters the same.