Passage Guide problem

Today in service I opened a passage guide by using the verse selector in the PG itself. I then followed to a commentary and read a little bit. I used the navigation tab to go back to the PG but it was blank. I put focus to the verse text box which activated the keyboard and I tapped the Go button at which time the PG repopulated. I followed a different commentary to Reading View and the same thing repeated. I did this with several commentary links and each time the PG would be blank (but retain the verse reference) when I used the navigation tabs to return.

I had not noticed this behavior before. I will test again given a chance.