First launch of the PTR.
I tabbed out of it to go back the PTR announcement/notes to review the changes. When I was done, I clicked on the D3 tab on the Start Bar and it borked.
A small white rectangle appeared in the upper left corner of the screen, but the rest of the screen remained as it was (the desktop and web browser were still there). However, I couldn’t interact with the desktop/browser as if something was covering it up.
I tried to tab out again, which would cycle through the open apps on the desktop however, I couldn’t interact with the desktop no matter which app I brought to the foreground.
I had to force shutdown and restart the computer to get my desktop back. I wanted to take screenshots of all of this, but without the ability to open Paint, I couldn’t.