You're on to something. The active cable must be the difference. It's a big jump to upscale from 480p to 4k. I see your active cable is 15 meters. If that's the necessary length, you would need an active cable. I'm using a 12ft 18Gbps non-active cable and have no problems with OSD.
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Main HT <> 976 <> 7200 <> Ultra-X12 <> sapphire ST2 mkII RF/LF <> sapphire SC center
sapphire ST2 mkII SBR/SBL <> sapphire SS SR/SL <> Verizon/DVR <> Vizio M70Q7 <> Oppo UDP-203 <> Amazon 4k Fire TV