Hello, I'm sorry about this issue. Unfortunately, we have no idea what could cause this kind of problem.
You can send us the debug log you can find here:
~/Library/Logs/GrizzlyGamerStudio/Robin Morningwood Adventure/Player.log
I can't make promises, but it hopefully will tell us what's going wrong. Please send it to grizzlygamerstudio@gmail.com
Also, do you know if something changed when the issue started happening? Like an OS update or a game Update?