26 May 2021, 19:20

Hello, I'm new to this forum!

I have exactly the same issue with Recalbox 7.2.1 Reloaded on an stock Rasperry Pi 3B (without the +). I was able to run some N64 games quite well on that hardware with 7.1.1 Reloaded.
Even Perfect Dark was reasonable playable.
Now I have this black bar in the lower half of the screen, sometimes larger, sometimes smaller. Mario Kart 64 and Super Mario 64 are running quite smooth, even with this issue. But for example in Perfect Dark and 1080°, (wich was also, not perfect, but playable on the older version) I have massive graphic errors in addition to this black bar in these games too.
I used in 7.1.1 and in 7.2.1 the standard emulator. I'm not sure wat that was in 7.1.1 but in 7.2.1 it's Mupen64Plus GlideN64. The same issue is with the Libretro Mupen64Plus_Next, like djib said.
The others are working better, no black bar and less to none graphic issues, but consistently worse performance.