Hi Bill,
First, try restarting XMetaL with the Ctrl key held down. That should reset toolbars to the default configuration.
If that doesn't work, the uninstall-reinstall procedure here is the next thing to try:
http://forums.xmetal.com/index.php/topic,67.0.html . Please let us know if that doesn't work.
Cheers,
Su-Laine