This is not so much a bug in a game, but anyway...
In Revolution X's Game Information window, under Rom Info, files revx.u51 - revx.u54 are listed twice. Also, since this game is a lightgun game, I have no clue how one is supposed to navigate the Service Menu.
In Galactic Storm (Japan), pushing the Start button to exit the different menus in the Test Menu does nothing. Te Start button works just fine otherwise. Also, is it possible to implent an "invert Y-axis" option in the game inputs window? Galactic Storm uses inverted (flight stick) Y axis, and I personally can't handle that very well.