memtest video sync issues with direct video

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cacophony
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memtest video sync issues with direct video

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I recently hooked a second MiSTer setup I had to my PVM-14L5 using direct video with the following setup:

HDMI to VGA adapter (claims to have AG6200 chip, but I haven't verified)
VGA HD-15 to 5 BNC RGB cable (https://www.monoprice.com/product?p_id=566)
I have the grey cable hooked up to the PVM's sync port and black is not used

Then in mister.ini I have:
direct_video=1
composite_sync=1

This setup has worked perfectly for the following cores: NES, SNES, TG16, 7800, SMS, GENESIS, COLECO, GBA, NEOGEO

But when I try memtest it looks like it can't sync properly and the video output isn't readable.

Any idea what's going on here or suggestions for something to try?
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