I suddenly can no longer view any videos; after a long pause at a black screen I eventually get an "Unsupported Format" error. This was also just reported in the Oculus section, so I'm guessing it's a server-side change/bug/problem rather than something with the app.
Happens on a Lenovo Mirage Solo with just-updated SLR app, and also on a(n original) Pixel XL with an older app. (After I encountered the error with the Mirage Solo, I tried the Pixel, which I hadn't used for VR in several weeks.)