I think there is a small bug in the Roku channel. When I turn on Night listening mode on my Roku Premiere+, I cannot playback any recordings that are recorded in 5.1 surround sound. Turn off night listening mode and everything works just fine.
Roku Premiere+ (Model 4630)
Tablo channel v2.7.0
Tablo firmware 2.2.22
@TabloSupport Please see the attached screenshots.