Cameron, honest I haven't been spelunking just paddling around a bit! 
When I open up Tools:Lookup:Cited By it selects the passage that I have open, pauses for a few seconds and displays this:

Then when I click the Search button on the Cited By tab I get this in a new tab:

Is this how it is meant to work? 
BTW Please ignore the passage details. These were two different runs just to see if it replicated. I screenshot Cited By tab in run1, and Search tab in run 2. It was only when I inserted them that I realised there was a difference. 