Crash on opening Sekhema Chest

Reached the end of the Act 2 Trial of the Sekhemas, got my Ascendency (thankfully), and converted my remaining water to keys. That gave me a gold key (which I had 0 of before), which I attempted to use on a "Mysterious Golden Chest," and got an instant crash to desktop.

This happened probably around 12:55 EST on Dec 7, on my character "GhotiPunch," connected through the Washington D.C. server.