Please read this:
http://www.wowrage.nl/index.php/topic,1736.0.htmlAlso, a player's Cache Folder is simply a "local copy" of server data. The game looks there first for basic info, so to force the local copy to update, simply remove it.
Right Click on c:\program files\world of warcraft\CACHE FOLDER
and [delete] the Cache Folder
-no harm done.