I also had similar issues. Though I'm not sure of exactly what fixed it, try the following:

Help -> Update -> Repair install
(once the program reboots)
Tools -> Options -> Display Tab -> Ingame overlay set to Auto (Rather than x64 or x86)

After that, I loaded up the game / RTST and toggled the interface / crosshairs on and off. (F2+Shift), and (F11+Shift).