Custom Scenario always freezes Turn 2

[Capnmud]

I created a Custom scenario. Playing as US single player mode it freezes every time (3 for 3 so far) on turn 2 after moving a tank. Played through ok when I played German side.

Annoying as after closing app all progress is lost and have to try start again. On that note it also does not seem to be possible to leave a single player custom game and come back to it - app does not ‘save” progress like in other campaigns. A save option would be appreciated

Thanks,