This just started recently, over the past two days. When selecting something to load, I get the loading icon, then nothing happens. This started when I attempted to import a PDF. It would just rotate, and then go dark, as if it’s not available. The PDF loaded fine in other apps. But ever since then I get what you see in the screen shot. Closing the sometimes helps.
Screenshot:
https://imgur.com/a/ok6JNWM
