That would be a fail on my part! Alas, it's not cursor placement. If I go outside of a sub it will show blank in many cases but not all. If I click a sub, it shows 0.00. I opened the .analyze file and see the HFR as 0.00 in all CaptureComplete lines, and if I manually put a number in there it does reflect in the graph, so the graphing appears to be working correctly.
I'll do some more debugging this evening and let you know what I find.