My Humax youview box started showing a problem after an update on 25 October. I have set it back to maximum power save settings, and done a MMR-4 but it persists. There are two faults that may be related:
[1] The HDMI output sometimes has a brightness uplift with a magenta hue, when this fault appears, the magenta hue is even there on standby.
[2] The HDMI output blanks after all the Please wait etc messages, in other words at the end of the boot. When the output is blank, the display on the unit shows the channel as normal. I've noticed that the "Rec" segment is permanently lit, even when not recording. A bug, but may not be related.
Sometimes the HDMI output will return after a few minutes, or will come up OK then blank. I have now confirmed that when the HDMI output switches back on, the box mutes the sound playback on the SCART output for several seconds.
Fault [1] is getting less frequent, but [2] is getting more frequent, it now happens every time I switch it on. The SCART output is OK, but as I can't seem to get RGB on this I don't leave it connected.
Powering down fully sometimes fixes it, as does going into standby, but it may take several tries.
I have raised a ticket with youview, they referred me to Humax.
If this is not sorted soon, I will have to return it under the Sale of Goods Act.