Yes.
Then I need the emulator con fig file from AN emulator folder, that could be helpful
If I change the layout for the VPX to something besides ArcadeFlow the interface remains usable.
Great! I was able to replicate the issue, now I'll be traveling all day so I'll need time to patch a definitive solution, but for the moment try this: in your .cfg file change the line
system Pinball
to
system Visual Pinball
this should fix it for the moment.
EDIT: Fixed! It was easy, and I'm an idiot: do you remember the patched layout.nut I prepared for you? In that patch I put a workaround but forgot to comment out the old line of code causing the error

I'll implement it in 9.1 soon