open door replaced by closed panel-crematorium

In the Crematorium, a door (showing on mini-map as yellow dot) is open and I can pass through it fine, but it looks like a solid panel (not even the usual jail cell door). There is no 'door' context tip to click on, the door is actually open. Came back to this area and found it like this.

Windows 7, 8GB, Sapphire ATI Radeon 5570

Will post the image as soon as I figure out how (How do you get it from screen shot folder to here?) Bug report ref # 2730002470.