Same issue here. I have an HDMI switch for a PC and Roku Ultra (3 days old) to share HDMI 2 port on my TV. HDMI 1 is used for satellite STB/DVR. Switching between HDMI 1 & 2 on the TV or PC & Roku source for HDMI 2 'supposedly' causes HDCP connection issues that produce purple screen without the "HDCP error message". Thumbnails in the Roku channel screen and video thumbs within the channels (Youtube, History, Prime Video) are all visible, however, playback produces the purple background with only audio. Restarting the Roku, while selected for viewing, fixes the issue and normal video viewing is restored. Have tried the Roku direct to HDMI 2 connection remedy but still have the issue when switching HDMI inputs on TV. Previously worked fine with the Roku 3. Roku needs to fix the HDCP bug.