Re: Mouse cursor doesn't match in-game UI position
1. The build number of Inner Space you're using
2. Whether the game is set to "Windowed", "Windowed Full Screen" or "Full Screen" -- you do have to actually check the in-game setting
If you're on build 5616, the current live build of Inner Space, then do what is suggested in previously the thread: try the development build (now 5618) and let me know if the problem is solved for you