I haven't heard of it before.
But I would suspect the "usual suspect", Normal.Dot.
Use your computer's Search to search for all instances of normal.dot and delete them all.
Re-open Word and it will re-create normal.dot. See if that helps.
Normal.dot is the main template for Word, and can sometimes get corrupt.
Mark.
When i try to enter a data in a MS-Word table the tab key works in the reverse direction. i.e. pressing tab takes me to the previous cell and shift+tab takes me to the next cell. What could be the problem?
Thanks.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic