it sounds like 1 and 2 are related, and HDMI-CEC is really NOT turned off in the display.
the 591 cannot generate on-screen volume graphics, it is being created by the display via HDMI-CEC. this could also be why the passthrough is flaky.
if you checked and FOR SURE the HDMI-CEC is turned off in the display, try unplugging all the HDMI cables, powering off all devices fully (unplug for 10 minutes to clear static charge), and then reconnect the cables and power back up. sometimes that will clear up the HDMI cobwebs...
the 591 cannot generate on-screen volume graphics, it is being created by the display via HDMI-CEC. this could also be why the passthrough is flaky.
if you checked and FOR SURE the HDMI-CEC is turned off in the display, try unplugging all the HDMI cables, powering off all devices fully (unplug for 10 minutes to clear static charge), and then reconnect the cables and power back up. sometimes that will clear up the HDMI cobwebs...


























