Saturn Video issue
I've been using the Saturn core for a while now, but yesterday I noticed something strange. When the core boots up, I don't get the broken glass animation anymore. Instead, I'm immediately dropped into the Saturn OS/launcher. There are very noticeable horizontal lines on the screen, but I haven't set any scanline overlays. What's even more confusing is that in Winter Heat, the pre-event tutorial looks perfect the lines are gone, but once the actual event starts, the lines reappear.
I've tried every Saturn RBF I have, old and new, single and dual. I've also reset my Mister INI, searched Reddit and Discord, and it feels like this is unique to me. I'm using a 4K computer LCD via HDMI out and have tried various display resolutions – 1080/60Hz, 1440/60Hz, and 720/60Hz. I have dual 128MB SDRAM, and a soak memory test cleared. I've also experimented with different sync and scan settings in the ini settings, but nothing seems to work.
Every other core is fine and crisp clean video but the Saturn just refuses to show without these horrible scan lines.
Anyone got any suggestions as to what I can try to resolve it?