Title says it all. I was at the in-world shop at the bottom of the palace (near the mission exit). Checked to see if I had enough Enigma Whatsits for the owl. I didn't, so I exited the shop. The shop UI vanished, but I wasn't given control back. Just stuck staring at the shiny little carriage. It *felt* like it was waiting on me to make a dialogue choice, but there wasn't one there. No amount of key-clicking worked to resolve the issue.
(It is worth noting that I had spent *several* hours grinding and farming. The sound I made when this happened...)