KM 76RC(1) here, the link works quite well. You may want to play with UA strings, although for this I'm using what I consider to be very generic KM: "Mozilla Gecko rv:38.0 K-Meleon 76.0 20160503", but it's not what Dorian shipped
Some videos are geo-locked, and it's needful to enable Flash (!!!!!) for all of them, but the ones that do play are very good.
I'm not sure Opera Presto still has the muscles to lift these newer sites off the ground, I only keep it (12.17) for forensic work, and it's rapidly becoming less useful by the week.
Do you get any error messages?
Gigabyte H61M-USB3-B3 r2.0, I5-2400 3.10GHz, 4GB RAM; W7HPx64 SP1, Lotus SmartSuite 9.8, K-Meleon 76RC, Pale Moon 26.4.1, IE11, Clyton email 15.0, Foxit Reader 22.214.171.1246, PaintShop Pro 6.02, ZAM Free 2.74, SuRun 126.96.36.199, VoodooShield 3.59b
"Learning is not compulsory. Neither is survival." Dr. W. Edwards Deming.