Lots of interesting guesses, but the previous Regiequiz seems to have stumped our panel. The opera depicted is one that has become something of a favorite of revisionist directors, La Juive. You can see some of the more interesting bits of the staging in context in this video from the Staatsoper Stuttgart: 

[kml_flashembed movie="http://youtube.com/v/xEnPr8jbjb0" width="425" height="350" wmode="transparent" /]

And now on with the game. Can you name this opera?