In the refactoring to use generics in r24428, a few places were left using the old method of "instanceof Character", which was failing. And so the register contents were never displayed or made editable.
This patch, against r24670, fixes the few remaining areas.
Ignore my previous comments. I was running the wrong version and now I see the one with your fixes and indeed, there is stuff in the right pane now!
Committed revision 24765