If you use the old ppu some games like Battletoads, Battletoads and Double Dragon, Super Mario Bros., Teenage Mutant Ninja Turtles Tournament Fighters, Milon's Secret Castle and I think others (this are the only I have tested for the moment) will have bugs or will not work.
So, instead of using the old ppu you will have to use the new one.
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Family Feud crashes for me. The game launches, is playable until the point where you enter your family name, and then when the first gameplay segment comes up, you either get a black screen or a bunch of gibberish printed on the screen.
PPU reading got broken in the Old PPU when trying to fix Young Indiana Jones, it's carrying out stuff that's supposed to happen with rendering ON while rendering is OFF.
its been fixed since 2015, wait for a newer interim build on the website or compile it yourself.
Interim build updated, use that and see if any of these games are still broken with old ppu. Keep in mind I am also only interested in regressions compared to previous FCEUX's (particularly 2.1.4)
Closing this issue. Create a new one if you find anything still broken.