Been getting reports that Rubicon has trouble running on Microsoft's latest hey-know-what-would-be-fun-switching-your-OS update. I don't have a Windows 10 computer to test it/make a fix (and won't for the foreseeable future), so I'm just gonna declare it unsupported for the time being.
Sorry for the inconvenience. I just don't have the resources right now to fix it.
Edit: Sounds like even compatibility mode might not work. I'd rather people give it a pass than have a bad experience due to technical problems, so if you have Win10, I'd really recommend holding off for the time being.