I have 4 virtual channels setup. When I try to play a movie from the guide on any of my firesticks the application just closes and brings me back to the firestick dashboard. I tried the same process on my ios devices and the channels work as intended.
Yes this is a bug in the recent release. It's been fixed in beta and we're aiming to do a release soon
Submitted v4.4.1 to App Stores for review