same issue. the firmware fixed my xbox one x black and white issue. now my panasonic DP-UB820-k goes black and white as well once i change hdr optimizer to on it went black and white. i backed out and returned to home screen which reset everything back to color with hdr optimizer still on. yeah the monitor still has a black and white HDR bug when watching or streaming movies in 4k hdr. Hope Eve can find the root cause of this soon. Firmware 105 fixed black and white issues.