In race pause menu don't respond to any mouse action, mouse pointer is visible, but no select color change with menu element. Win 10 PC with steam vr, has been running rf2 for years, first time run with new ui.
UPDATE: I've remove all packages and reinstall whole rf2, still no response. Seems to lost focus to other apps and never regain focus. ALL OTHER GAMES(AC ACC Forza5) WORKS FINE.
You have almost certainly tried this, but just in case... Have you tried to alt-tab out and then back in again? This happens all the time for me in VR and the alt-tab trick always fixes it.
For anyone else searching this was resolved to be caused by using an alternate input language in Windows that didn't match the system settings.