I've tried everything and have a similar issue that I cannot seem to resolve. Main menus are navigated with a mouse easy enough, is NOT window restrictive of the pointer, but when a level starts the only thing that does anything is the Space Bar (the odd graphic toggle).
It's a shame, really. The music of the first stage (of which I've restarted (along with my computer) many times trying different solutions) seems catchy enough. Eheh. OS compatibility, non-unicode language settings, locale... I'm stumped. If anyone has any suggestions, that'd be grand. Otherwise, I'll have to skip this one for now.
Win7 64 OS