When I'm watching liveTV on a channel that is being simultanuously recorded, then change channels, you are taken back to the Guide but the new chosen channel is playing in the background (sound but no picture). If you highlight the new chosen channel in the Guide then a small window appears in the bottom right corner with video.
I'm running 17.0.117
Could you please investigate.
PS: I'm recording in TS format if that makes a difference.