100% credit for this fix goes to xekarfwtos - who recently found out there are some missing files with the linux install for this game.
100% of the blame for this problem, goes to me of course.. It will be fixed in the new version. In the meantime, xekarfwtos has figured out how to work around:
One outstanding problem (again, my fault) is that you will not get any sound. Again, will be fixed in the upcoming V5 build.
Huge thanks to xekarfwtos for figuring this out, and sharing the fix with everyone on the discussion boards.