OK, will do!
You can use [game title].png, where [game title] is the ROM title. If you run the ROM in VBA-M and go to File>ROM Information, you'll see it.
libertyernie, I found a version of VBA that plays both Super Mario Land 2 DX and Metroid 2 DX hacks just fine.
VBA 1.8.0 Beta 3 does the job quite good.
I attached some pictures as proof.
Hope this helps on debugging the issue.