I was not getting the black bar. on 16.4.1 and couldn't reproduce it until I tried to reproduce the External Graph crash. The External Graph was fine, no crash, but when I went to the More tab and selected Basic Graphs. Good golly miss molly, the black bar at the top appeared. If I kill the app and restart it, the black bar goes away.
Here's how to reproduce the black bar: Tap More, tap any row on the More page. The black bar will appear and continue to appear for the More page. The black bar only appears for items on the More page and for all the items on the More page. Kill the app to restore it to its normal appearance.
Is anyone getting the black bar on earlier iOS versions?