Looks like -video bgfx (I'm using the crt geom effects from it) and the Game & Watch multi-screen games only shows the effects on one of the two screens.
Figured I'd post here before mametesters just to see if it's a design decision/limitation and/or being re-worked currently.
-enable_hlsl seems to not do anything on those games; are they internally prevented from using it or use the \ini\preset\lcd*.inis or similar?