I have a video a snap and a marquee folder setup but the videos are working on the side cabinets but not the main cabinet. Also the marquees are not showing, what am i doing wrong? Heres my emulator cfg
# Generated by Attract-Mode v2.5.1
#
executable C:\mame\mame64.exe
args [name]
workdir C:\AttractMode\.
rompath C:\mame\roms\
romext .zip;.7z
system Arcade
info_source listxml
artwork marquee C:/mame/marquee
artwork snap C:/mame/video;C:/mame/snap
Not sure if this will help or not, I am running Attract Mode on Manjaro Linux. I had the same issue as you where the video snaps were showing on all the cabinets except the middle one.
What worked for me was I used a text editor and edited the file layout.nut in the Arcade Row theme folder. There is a line around line 35 or so that read in my case
local snap0 = fe.add_artwork( "video", 270, 146, 100, 80 );
I changed "video" to "snap" in that line and saved it and now the main cabinet is showing the video snaps.
Not sure why the marquee's aren't showing up.