Frustrated, any ideas appreciated 2 PCs with the same win10 o/s, both accessing the same video files both have the same plex server both have the same Roku box One is fine, the other with the thumbnail issues. The thumbnails: the library icons look normal but if I select a category, like tv, the thu...

Presto, problem resolved. After playing with this setup for a week, I decided to reset the TV back to where it was when unpacked. Went through the setups, and now it works as it was suppose to, no flashing. I will never know why it didn't before. Just for the record, I would be just as happy with a ...

I have tried 2 different roku premier+ with same results New Samsung un55ks8000 tv Bypassed my audio system and connected direct to the tv Replaced the hdmi cable (3 different brands rated for 4k) Roku is set for 4K UHD HDR TV    If samsung hdmi uhf is off - works ok    if samsung hdmi is on - momen...

Thanks for all the info

A little confusing. So if I leave the HDMI UHD [size=100]Color set to Off (supports up to UHD 50P/60P 4:2:0 input signals)  it will produce the best picture, providing a the 4k suhd picture.[/size]

Samsung manual

HDMI UHD Color set to Off supports up to UHD 50P/60P 4:2:0 input signals,
while the HDMI connection with HDMI UHD Color set to On supports up to UHD 50P/60P 4:4:4 and 4:2:2

So does this mean that the Samsung 55ks8000 doesn't support uhd

[size=120][size=100] [font=Arial]HDMI UHD Color set to Off supports up to UHD 50P/60P 4:2:0 input signals,
while the HDMI connection with HDMI UHD Color set to On
supports up to UHD 50P/60P 4:4:4 and 4:2:2 [/size] [/font][/size]

Screen blanking problem resolved.
Turned off the HDMI UHD on the Samsung TV.

I replaced my hdmi cables with BlueRigger Rugged High Speed HDMI Cable - 3 Feet (1 M) - Nylon Braided - Supports 4K, Ultra HD, 3D, 1080p, Ethernet and Audio Return (Latest Standard)

Didn't help, same issue.

Tried good hdmi cables

I hooked up the premier+ to a new Samsung 55ks8000.  New HDMI cables, HDMI ports meet the requirements.

Start a show, all lloks good, then every few minutes we get a quick, momentary, blank screen

Frustrated, any ideas ?

We have a Roku2 and a roku 3.  The roku 2 seems to take longer to load applications. For example youtube, Plex server eyc. When starting the Plex server loads the initial icons, but scrolling to theright they are blank for a minute or so.  With roku3, which is closer to the router, they appear immed...