CSN's images were all missing yesterday too, but they showed up again in about 15 minutes. Of course I don't know how long they had been missing when I first noticed they were gone. Guess I need to go back and check again. aaaarrrrghh.
Over the last week we have been moving information from one smaller server to a massive one due to space issues. If images weren't showing up, I would assume the issue can be attributed to this move as it caused many problems over the last couple of days. Luckily they were all solved quickly, but definitely keep me posted if you see anything out of the ordinary going forward and I can report it to our tech team.