Hi10 (10 bit video) playback problems on Windows Media Player

For some reason , it works on Windows Media Player Classic, but on my preferred Windows Media Player, it plays after a bit of a delay, but no picture.
Inexcusable as I'm on Windows 10 x Intel Core i7 Skylake CPU x 8 GB RAM. Using K-Lite Mega codec pack. Thanks.

Codec Tweak Tool > Media Foundation > disable for .mkv

Then WMP should use the codecs from the pack and playback will works the same as in MPC.