This was fixed a while ago after an emergency maintenance. It's not a terrible thing, but it's back again now. And it's anoying.

Details:
Game Client crashes when performing /shutdown to the desktop.

Steps:
Selected "Exit Game" from menu, screen went black, little loading icon in the bottom started turning like normal, game gave me an Error stating the program had stopped working.

Date & Time:
Hardly relevant, but 2:22 AM GMT+1, on the 18th of december (post-patch 2.1)

Operating System:
Windows XP 32-bit