Run the program in compatibility mode for Windows 7, with Windows 8. That will fix the issue for now. People are still developing more things for the builds/O/Ss that already work, and working on porting and whatnot.. I'd say fixing it all up on 8 might be in their plans but is probably not high priority at this time.
Howto:
Right click on the program, goto properties. Goto Compatibility tab, click box marked Compatibility mode, then select a different O/S with the menu, click OK or Apply.
You won't need a downgrade of O/S with this method.