My 4800X just got took the 4201 update and immediately started the HDCP errors where previously I had never seen an error.
I followed an older thread which led me to Settings > Display settings. My resolution was set to auto detect and was now coming up as 720p HDCP 1.4 while it is a 1080p TV. I turned off auto and manually set it to 1080p which it told me wasn’t supported (but it is) and I forced it to try it and of course it worked fine. Tried Netflix, same error. I powered off TV and Roku and remove HDMI cable from both (again for the millionth time), HOWEVER, this time it worked. No more HDCP error in any app. YMMV
Updated to 10.5 and now flickering green screen several times after boot screen. Then I try to play any app and get HDCP error detected screen. I have tried several HDMI wires and factory reset multiple times but still have the issue
After fiddling with the settings, I'd like to report back with my workarounds; maybe this is helpful for some of you.
I get the impression that at least the issue with the failing screensavers is the new Power settings that have a low-power mode come on after 20 minutes. It seems that under RokuOs 10.5 this setting is now on by default. When waking up the Roku, it seems there might be some conflict with the screensaver not being shutdown or woken properly.
I have a stable Roku Ultra 4800X box now after making the following changes: For display type, switched off auto-detect and manually (force-)set to 1080p. Switched off the screensaver under "Theme". Left the 20min auto-power-off setting on under "Power". So far, no more HDCP errors. (But I am on an older TV with HDCP 1.4 only. This is 10.5.0 build 4201-C2).
It also seems that restarting the Roku fixes some things, and without any new software updates, stability got better. So maybe the software "learns" somehow, or maybe the streaming services changed something on their end as a workaround.
In any case, just wanted to post this to give y'all some hope 🙂
Exact same issue here. OS 10.5 on Roku model 4800X. After some time (maybe 12 hours?), the resolution resets to 720p and can’t play videos due to HDCP error. It says my 4K HDR tv can’t support anything but the 720p. Used to be just fine at 4K HDR. Restarting Roku makes it work for a bit. Maybe a problem with sleep or waking from sleep?