On the 5.26 build with the OGA 1.1 I can’t run any NES games. Manually switching emulators/cores also does not help. Both return to a black screen. All other systems seem to work (and the ROMs work fine on the RPi and X64 builds).
Working fine on my OGA 1.1 with latest 5.26 build
Found the problem: Had the Romset with missing headers - Mesen works fine with them, but Mesen is not on the OGA. Adding headers did the trick. Followed this guide: https://nerdlypleasures.blogspot.com/2020/04/fixing-nes-headers-and-renaming-nes.html