Hi folks-
I have a new MiSTer that I'm trying to get working correctly with my JVC tv using YPbPr. I added YPbPr=1 to the ini and adjusted the SOG switch. The 5v jumper is also set on my board. The menu is readable and cores like NES work perfectly. However, I'm getting a flash black box on the core menus about every 3 seconds.
Screenshot of the problem: