In the past couple of months, Elementary Terminal has started behaving oddly. If I open a terminal, type "sleep 20" in the shell, then attempt to close it, I'm greeted with the "Are you sure you want to quit Terminal?" prompt:
If I tap the red "Quit Terminal" button, nothing happens until I either close the tab manually (by clicking on the "X" in the tab) or by ctrl+c'ing the sleep.
This happens even if I login under a Guest account, so I don't believe it's anything dconf-related. It's also a new issue.