mac fails on save

Only once did I actually have vassal running where I could actually watch a game on line on a windows machine. Went to a mac machine and could load a board place the pieces but when I went to save the board with pieces no dice. Quite frustrating. Don’t have any electric so mac isn’t running but would like to know why it did that. Anyone install linux on an ipad and then run vassal??
Would be nice to get it working. I would like to enter a PBEM game I have some of and be able to watch it.