Nope. Still not working.
Arcade-[POTATO]-[GDV-MINI]-[Vertical].slangp
#reference ":/shaders/shaders_slang/bezel/Mega_Bezel/Presets/Base_CRT_Presets/MBZ__5__POTATO__GDV-MINI.slangp"
//HSM_ASPECT_RATIO_ORIENTATION = "2.000000"
HSM_ASPECT_RATIO_MODE = "2.000000"
HSM_POTATO_SHOW_SCREEN_OVER_BG = "0.000000"
BackgroundImage = ":/shaders/Mega_Bezel_Community/Duimon-Mega-Bezel/Graphics/_Potato/Arcade/Arcade_Vertical.png"
Edit: SInce the Carbon Fiber image is showing can we assume it is defined in the base shader as BackgroundVertImage and not a 16x16 placeholder? Or is it falling back to the wrong Horizontal image? (The one defined in the base preset.)