Context: Shield TV Pro 2015 UHD 59.94 YUV 420 10 bit Rec 2020 connected through Marantz SR5010 to Samsung 4k HU8500 running the SEk3500 Evolution Kit.
1. Since 3.7 (was working without any problem in 3.6): permanent artifacts in German 1080p50 HEVC DVB-T2 HD content streamed from tvheadend as soon as "MediaCodec (Surface)" HW acceleration is enabled. Only using the other "MediaCodec" HW acceleration works perfectly but disables HDR :/ Permanent block artifacts and out of sync audio.
2. Since the Nvidia Shield TV 7.2 public release yesterday, MrMC only uses 1/4 of the screen in UHD mode
FYI: Latest Emby client does not have these issues.