Lightroom :: Create Keywords At Highest Hierarchical Level in 5?

I cannot seem to create a new keyword in LR5 at the highest hierarchical level.  When I try to create a new keyword, either with an image selected or not, it puts that new keyword in as a (third-level) sublevel keyword within a keyword that I have created in the past.  I can move the newly created (sublevel) keyword to be a sublevel keyword within another previously created highest level keyword.  But I cannot create a new highest level keyword.