Thanks for your answer.

Right now I only have the roms in an "evilngt" zip and the chd in a "hellngt" folder (there are no duplicates).
I thought you meant I had to rename the chd folder to "evilngt", but if I do that then I get "Set archive AND set folder exist in the same rompath".
In case it helps, the game loads fine in mame using either name.

Sorry if I'm missing anything obvious, but any suggestions I could try?

Thanks!