I had few issues with the Vive again today with a blank screen for few secs in 3 different instances and once when I was finally able to see the track again (those seconds last forever) I was up in the sky. Took me even more time to find the ctrl+space and get back on the seating position and drive straight. This happens also with AI and always when in close racing with other cars and engaging the FFB in a turn.
Very glad I was able to keep somehow my blind course without hitting anybody and I hope I did not get in the way.
Since Vive support is official up, I've just posted the issue with Kunos and hope it will get fixed by next Wednesday.