I changed its cardtype to Basic. I think we may have this problem any time a *tform becomes something other than Basic, so we should probably look into that a bit further.
This one was especially challenging; I had to fix it through the console. I had to change its extension type to user so that the before_delete on invitation type (which blocks the user) wouldn't explode. Then I set the type to Basic by hand.
--John Abbe.....Thu Jul 24 14:10:44 -0700 2008