New High-End PC Build has weird horizontal "split" lines when Flash Player attempts fast-panning shots - HELP PLEASE!!!

I have just built a new pc as my previous one, built 10 years ago, was running short of cpu and memory capacity.  Here's the specification:-

Case                Fractal Design Define R5 Silent Case

Power Supply    EVGA SuperNOVA GS 850 Watt Modular 80+ GOLD PSU

Motherboard      Gigabyte Z170X Gaming 7 Skylake LED ATX

CPU                Intel Core i7 6700K Unlocked Skylake Desktop

CPU Cooling    Noctua NH-U14S U-Series CPU Cooler

RAM                G.SKILL Ripjaws V Series F4-3200C16D-16GVR 16 GB (8 GBx2) DDR4 3200 MHz

Graphics Card  Palit NVIDIA GeForce GTX Titan

Drive C            Patriot BLAST 960GB 2.5" SATA SSD/Solid State Drive

I was hoping for great graphics and the pc performs faultlessly in that regard when playing games, when viewing DVDs or when watching videos on a VLC media player.  The problem occurs when watching a video played on the Flash Player such as on YouTube.  It is very evident when using Google Chrome and can just, but hardly, be seen when using Internet Explorer.  I have tried disabling the player via chrome://plugins/ and have relied on the downloaded and installed version 20.0.0.235 for my Windows 64-bit OS without any improvement.

I've uploaded a video to YouTube. At the beginning there appears to be screen interference but that is only evident on the camera so it is just a recording issue, not apparent in reality. The artefact appears in the second half of the video when it starts to pan (unfortunately it momentarily goes out of focus but refocuses in time to show the problem) which is especially obvious if you watch the tram.

I have also taken a screen grab of that and attached it as it is easier to see.

Can anyone suggest what steps I can take to resolve this issue.

Many thanks, in advance for your help!