In x-refs, which is a great tool, by the way, (my favorite new feature), when you have Freeze Window Contents selected and you add a new reference, the new reference will not display until you --

1. UNfreeze window contents
2. Refresh the x-ref window by moving forward/backward a verse in the browse window.

In other words, it takes at least three mouse clicks to get the new reference to display. If this isn't a bug, it ought to be.