I have similar problem.
I'm using KM 76 RC1 on W10 and youtube working fine.
When I copied it to Windows Thin PC (based on W7) youtube stop working...
I check this site https://www.youtube.com/html5 and it says:
H.264, MSE & H.264, MSE & WebM VP9 missing but on W10 missing nothing.
KMG working fine on both systems but I need 76 RC1 also.
So, W7 or Windows Thin PC need some code
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