Saw this, opened Oculus Home, there's a message in the Updates tab saying "An update may not have installed correctly", and indeed, VR apps didn't work.

Nate Mitchell of Oculus posted on Reddit saying "We're working on resolving this issue right now. We'll keep everyone posted on progress here." https://www.reddit.com/r/oculus/comments/82nuzi/cant_reach_o... . Top-level of that thread has a workaround involving setting the clock back or using a utility called RunAsDate to fake the clock for a single application.