but it just looks blank with a screen shot on mine
Do you mean you have a blank screen with just a screen shot? Use the MalaLayout.exe to edit the mll files to make sure you are pointing to the location of your background and not the person who created the layout. As far as the rest go in Mala under MAME config, Pictures and Videos Tab you point to your snap, marquee, etc folders there. For 1942 I believe that the flyers (hanging on the wall) is definable 1. You should be able to determine that from the layout editor. Also make sure you have the layout folder set in MaLa under GUI, layout Tab.
There is a section in the
MaLa Wiki that talks about all of this.
Another good place for images is
MAMEWorld. On the right hand side way down on the bottom is a section called Art Files.
Good Luck