Comment 9 for bug 327775

This has just started happening for me - only with html messages, but 100% reproducible.

Though I should add that the non-response has been going on for a long time (don't recall how many versions): when evolution has decided it is doing something it's non-response to a window closure circumvents the window manager's monitoring of that, so a killall is the oply thing that will close the window. This I think is a significant failing in the UI.