I am getting this same issue too, and could really use a solution. This is, in fact, not just happening on YouTube but on a number of other channels. In all situations audio and video overlays, such as pause/progress bar, etc, all still work. If I fast forward or rewind on channels the preview thumbnails show what should be showing once I hit resume however it also will go "gray/grey".
I have tried a number of things such a restarting the app, the device, resetting internet, checking cables (as suggested, though I doubted it was the issue), and nothing seems to fix it permanently. This has been plaguing me for well over 2 months and I'm just tired of it and seriously considering alternatives after using roku faithfully since version 1. (I own all the devices pre-v4 but am disabled and can't afford anything new right now).
Any help would be appreciated.
