Okay, so I finally got it to work. I'm not sure if LB automatically has the box checked when RA was added, but the "Extract ROM archives before running" was checked. I didn't think that was the issue because all of the other RA cores were working through LB when it was checked, but when I unchecked it the Neo Geo core loaded. Thanks for your help. For some reason, I thought I read somewhere before that it was supposed to be checked....but I may have misread something.