I was able to customize the custom top and bottom panels when I first created my wiki.

 

I then went in and changed the theme a couple of times and since then, this functionality no longer works.  Everytime I try and edit either of them, all it does it create a new page called CustomTopPanel or CustomBottomPanel.

 

This is really annoying that they are showing up as pages and not actually customizing the top and bottom panels.  I tried to switch it back and forth between the logo and custom but custom just keeps trying to create a page versus actually customizing the top or bottom panels.

 

Any ideas?