vbPlaza only adds TABLE_PREFIX like every single other vBulletin PHP file, that is definitely not the issue, I can assure u.
What is your TABLE_PREFIX inside of config.php? its probably vb judging from the above code. The problem is to be more "compatible" the vbPlaza uses table prefixes just like vBulletin. So the problem is really in fact with RPG Inferno not being compatible with TABLE_PREFIX's.
The only way you could get around this is to manually remove all of the " . TABLE_PREFIX . " from all of the php files that vbPlaza uses for the "points table".
-CMX
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