With mGBA if I try to make a savestate while playing a GB or GBC game, it causes Retroarch to crash (in a nightly or the last stable). Additionally it is not making SRAM saves for me on GB games (testing Mario Land 2 and Donkey Kong).
Also having trouble with mGBA and the last few nightlies (Windows). 22/09, 20/09, are the ones I tried with mGBA core updated to the newest version. I can’t open zip files using the core, it just returns to the menu when I try to. If I go back to the last stable build the zip files work again. Same thing happens with the Gambatte core.