I have tried your file you provided in your game thread - and rolled through all the battles without any issues using the marti dice server.
See:
https://www.axisandallies.org/forums/index.php?topic=31084.msg1724454#msg1724454
As the latest stable is 7621 (also Java 8 is on update #151) at the moment, maybe try this one.
Apart from this we really need the error message to get an idea about your issue.
(Schau auch mal bitte in deine Messages.)