Was there an update to the image handling too? On a cursory glance I see no image proxy failure notices, whereas last build almost every image failed to load.
We haven't changed anything, but it's possible your instance admins have made some configuration changes--there are some configuration settings that can mess with image proxying. The Voyager dev brought attention to this last week, plus put up a nice page about it--it's possible that the sopuli admins fixed their config in response to that.