If you are having problems finding or using cheats for an Emulator (particularly MAME/MESS) or have found a trick that you wish to share this is the place to do it. But please read the Cheat FAQ first.
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PROBLEM: Okay, I think QMC2 is the issue because Sega CD games STILL load through direct MAME call (NO QMC2)...actually I remembered this was another reason that Sega CD machine needed to work, so I could test if it was ALL cheats or just genesis cheats mysteriously stopped working....it only works on segacd machine, but not Genesis! LUA ERROR: in menu_callback: plugins/cheat/cheat_simple.lua:77:attempt to concatenate a nil value (local 'addr').
I upgraded to 226 release...and found that starting from (growl) scratch through cheatfinder worked; if cheatfinder's INSTALLATION instance has not already found f##k cheat already VERY SAME address/value-paired code won't work (including FRESH REINSTALLS). SO KEEP AN EXACT "SHADOW COPY" OF LAST MAME STATE AFTER IT SHUTS DOWN!