artwork is indeed labeled “snapâ€.
I checked with a virtual machine and even with 256 Mb of VRAM I could see textures , so that's not the issue. Can you check what kind of files you have in the snaps folder? Resolution, file type etc.
MAME 0.200 EXTRAs/snap
AntoPISA's progetto-SNAPS MAME Snapshots
Pulled from complete set neogeo, vs unisystem, and nofiller2p
Average file size of snap directory 22879.6 bytes using
$ find ./ -ls | awk '{sum += $7; n++;} END {print sum/n;}'
All images are PNG format
All image dimensions correlate to their games native resolution, mostly 320x224, 320x240, or some other 240p variation.