Hi,
I'm noticing the GUI is glitching when seeking and refresh rate switching is set on. You can find the log at the following link. Playback starts around line 647.
Odroid C2
HDMI ARC w Panasonic GT50 Plasma / Yamaha RX-V675 with 5.1
Passthrough enabled.
I can provide a video if necessary.
Hope this helps. Love LibreELEC otherwise. 