I was looking at a vendor and then clicked on the other character's portrait, thinking that maybe it would change to show their stuff, I heard the character swapping sound, but nothing changed on the vendor screen.
I closed the vendor screen and when it went back to the dialog there was a long gap between the dialog history and the "Take my leave" option. The option was grayed out an unclickable. I was unable to leave the dialog window and had to exit the game.
