Today in HMD mode on playa i did see the Vive screen in my HMD a few times short and then it disappeared again. This gives me the idea that the flickring i see in HMD and menithal to have something to do with that to.
Sad i cannot find a image to show it.
Anyway, installing new nvidia driver now.
Edit, i did see the screen while i where on Playa. that you see when you activate the steamVR software and have no program running that use the HMD