SteamVR Breaks Mouse Events

I have a simple scene. There is a default camera and a cube in front of it.
I imported SteamVR to my project, and suddenly the script below stopped working on the cube.

I did not actually use any of the SteamVR assets in the scene..
Even if I delete the imported assets, the output windows still says "OpenVR initialized!" and things are still broken.

I moved the mouse all over the screen, and finally got a Log somewhere above and to the right of the cube.
It does not matter if I run the...

SteamVR Breaks Mouse Events