Have you charged or shadowsteped to some mob and fell through the ground ? Before you click (release spirit)
Typ /script RepopMe()
then walk to where your corpse is and typ
/script RetrieveCorpse()
typ these just as you see them or it wont work, if it doesn't work (allready released spirit) exit game and go here.
http://account.wowscape.net/ucp/login.php
hope it was usefull