What format are you roms in? I was rushing the other day and accidently put the wrong roms (in zipped format) in with the wrong emu and couldn't boot them it kept giving me an error message then I finally I realized what I did. I will assume all your roms are in zipped format? If so they should show up if in the folder. Unless your putting the wrong roms (file extension) with the wrong emu's. Then they wouldn't show up at all I believe. Only zipped format and the proper extension for the emu would be seen by the emu.
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