Hmm, not sure if this block of information explains it somewhat Scott.
http://www.wowwiki.com/API_Region_GetRight
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This function is only guaranteed to work after the PLAYER_LOGIN event and then, only if the object in question is being Shown. Also, currently if you re-anchor an object or Show it, you will need to wait until after the next OnUpdate event before this function will return the correct new value.
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