Sounds odd, can the problem be in the mapperfile? RubyBox searches for mapper files from /usr/share/dosbox and /home/user/.rubybox/.mappers. So if you copy the mapper.txt to /home/user/.rubybox/.mappers and make sure the game uses it, does it work then? If RubyBox can't find /usr/share/dosbox/dosbox.conf, it uses the new one and if you replace the new one with the old one, it should work like the old one. You did update to 0.4.4 btw?