I guess you modified protox.xml. Well when an xml file is created and run from the game, an XMB file is created too. When you modify proto(x).xml (making sure to take a backup of both files first) you may need to delete the XMB first.
Since you modified proto.xml, which is for AOM not AOMX, it may have overriden the settings. Try restoring the protox.xml file and deleting the xmb.
When you reinstall you can choose to keep your saved games.
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Roxas, his heart was human, yet because of his status as a being his fate was sealed since he was born. How many times must humanity judge others like that as well without giving them a fair chance?
"It would be very irresponsible of me to give you my thoughts as you are clearly incapable of handling the ones you already have" ~some guy in OD