X3 / Word 2007 W.indows Keeps Inserting Citation Reference Over and Over

Friends, I don’t even know quite how to describe this one. I’ve got a 8 page Word 2007 document running under WindowsXP. When I changed the format of the citation/bibligraphy in CWYW from Turbian to MLA, it kept calling up X3 and inserting the citation in the text over an over. I mean 20 times until I shut down Word entirely. As soon as I pull the document back up, it pulls up X3 and starts inserting again. Yikes! Any ideas?