I haven't played a lot of Genesis games lately so I'm not sure when this started, but noticed on 1.10.1 and up, Genesis GX Plus is exhibiting some strange graphics issues in some games. I can't say I've thoroughly tested, but can confirm it's fully repeatable in Greatest Heavyweights boxing. Load up an exhibition match and just mash buttons and you'll see the graphics flicker and go all garbled.

I don't recall this happening in prior versions (1.9.x and below), and also doesn't happen in Picodrive or in other emulators I've tested, such as Blastem on PC or MD.emu on Android.

I tested on 1.10.1 and 1.10.3 nightly today and updated emulator core to confirm it's still ongoing with current build. I also replaced the rom and tested another copy to the same result, and also deleted and redownloaded the core just to make sure it wasn't a fluke.

Not sure what the issue is but if anyone knows a fix it'd be much appreciated.