I watch DishNetwork via Hopper /sling and with Slingbox M1 (backup). All is OK with Desktop HP and Toshiba laptop.
I just purchased a new laptop ASUS X550V with Nvidia GTX 950M.
With both viewers, and both Firefox and Chrome I am seeing brightness flutter, even while the video is stopped. I do not have this problem with YouTube, Netflix or HULU.
I have the latest Windows 10 updates and have checked to male sure I am current with the Nvidia driver.