How old are you ROM files the cps2 stuff was updated within the last year and if your ROMs don't include the ,key file that was added to every game they will no longer work with the latest version of MAME or RA with the latest two MAME cores (MAME and MAME 2016) I don't know if that is your issue but I know that it recently caused me to update my ROMs in order to play CPS2 games