Categories View Tab Issues

[Darius1968]

I have experimental features turned on, and I'm in Categories view, having problems with the four tabs - Properties, Builder, Category Filter, and Bookmarks: 
Specifically, any one of these four tabs - while auto-hide is not active - is locked at the top of the pain, and will not let me resize.  So, I can not see my category tree!  If auto-hide is on, then I can resize, but as soon as I turn off auto-hide, the memory of where I last positioned the tab is lost, and it now, once again, covers up my whole category tree.  What's wrong?