I think it's a bug - already reported to the lr-prboom project here.

@mitu It works now. Thanks alot!

Found a solution: 720 Degrees (revision 4) on lr-mame2003 (I think I unzipped 720 and 720 rev 4, merged the contents then rezipped as 720.zip). Paperboy (revision 3) also on lr-mame2003. Both work very nicely now, with no nasty tearing/glitching effects.

You could move the save file to your PC, go passed the broken area and then put the save back on the Pi.

@greenhawk84 It should be fixed in my last commit.

@joabro One possibility: usually ROMs are either European or American, and these regions have different video systems compatible with the TVs of their respective markets. The former games are PAL 50Hz, meaning they refresh at 50fps. The later are NTSC 60Hz and refresh at 60fps, running slightly faster. So one possibility is that if you are from an European country and are loading a set of US ROMs, you may have this perception that it’s all a bit too fast (and they are, indeed, faster than you remember). If that’s the case, I’d say stick to them as this is how the games are meant to be played. People prefer US ROMs even in Europe, so much so that even Nintendo have loaded their European mini consoles with American versions of their games.

also, to ensure that none of my changes have affected this, i just tried a default, no rom, freshly downloaded install. still the exact same results.

@dickhams Got it. Yeah, I don't expect the Pi to be consistently at 60fps. And, likely, when the audio glitches start, you'll find that it will be likely related to in-game slowdowns. I'm surprised, though, that that didn't seem to happen in Recalbox - I thought the emulators were very much the same? I'm sorry I don't have a lot more to contribute to here, though I suspect that it is related to in-game speed. Would the Recalbox default setup be slightly overclocked? I'm speculating. I don't think that's the case, but throwing it out there. You may also try to briefly overclock your Pi and see if the problems stay the same, just to attempt to check if it is indeed related to speed or not.

@AlexMurphy yes, thank you! I've changed the core emulator to something something genesis and now it isbfully working. So happy 😊

@mediamogul yeah I just did, and still the same. I even tried copying the love files over from another install and still the same. I will have to test love on that Pi later to see if it's the same, but last time I tried it wasn't.

@skoufix Thanks, the fixes above did not work for me but yours did. I'm glad to finally get rid of the startup glitch.

i think i found the solution after a long time of troubleshooting I forced picodrive emulator and as extra i set the resolution at 640x480 DPK-2 or something instead of default. no more glitches in the textures!