Updating thumbnail was not possible with "Ocarina of Time - Master Quest". First, It was detected as another game and I had a different thumbnail. When I updated with the correct name, the thumbnail was still the same.
Looking in ~/.local/share/mupen64plus-qt/cache there was 2x thumbnails. The first was .jpg file, the one I saw and the second was a .png file ( Ocarina of Time - Master Quest). Deleting the .jpg file fix the issue.
I'm using Debian Stretch v1.9.
Updating thumbnail was not possible with "Ocarina of Time - Master Quest". First, It was detected as another game and I had a different thumbnail. When I updated with the correct name, the thumbnail was still the same. Looking in ~/.local/share/mupen64plus-qt/cache there was 2x thumbnails. The first was .jpg file, the one I saw and the second was a .png file ( Ocarina of Time - Master Quest). Deleting the .jpg file fix the issue. I'm using Debian Stretch v1.9.