being sunday night after midnight, I wouldn't be shocked if this is some type of maintenance on the systems, site or pictures themselves... A lot of companies freeze changes to systems around the holidays if they are the type of company that it would be a negative impact to their bottom line. My guess is it just lifted so security patches, improvements or even just site changes are considered ok to do again. Internet companies work the same way and the change freeze for most of them ended tonight at midnight so there is maints all over the world right now.