I think I did something dumb, but I don't know what. (I may have deleted some config files within the ROM folder one of the times I was clearing it out while testing games)
AdvMAME works fine...
Anyone know where I can set the folder for MAME4All?
Don't forget that you will need to change ownership of the /nvram, /cfg, and /hi to the "pi" user otherwise no game data gets saved. (and having to let Joust restore it's factory settings everytime you start it up kinda sucks)