Clicking the balloon help icon to the right of the room prefix field when viewing the room description in QDK launches the balloon help, but the balloon itself cannot be dismissed. It just stays on the screen.

Does it not disappear if you click the balloon or start typing?

It's doing it now. Yesterday, rather than appearing near the field like it's doing now, it was in the middle of the screen, and was acting like a modal dialog box. I'll try to pay attention to what brings it on if it happens again.