Did you ever get a response from Marseille for this? I’m having the same issue and it’s driving me mad 🙂
I have the OSSC going in to a HDMI switch then the mClassic, then my TV – I have three consoles connected to the OSSC:
RGB SCART: SNES
Component: Playstation 2
(all are high quality cables)
The Dreamcast works fine, no issues, but both the PS2 and SNES constantly cut in and out. I tried changing to DVI mode but that led to the SNES screen going green (!?) and have tried settings from multiple other threads but nothing has worked. All of the cables are high quality 4K HDMI’s and the HDMI Switch is a 4K@60Hz switch. My TV is a Samsung 40″ 4KTV but have had the same issue when connecting to an ACER Predator 144Hz Monitor.
Any held would be much appreciated 🙂