I am in the middle of making changes to my site when out of the sudden my logo changed to this picture: What's even funnier, the link didn't change, it stayed the same (the same folder, file name, file on date in media library was same, it all just looks different). After downloading, the file looks changed (the above instead of logo). After few minutes photos in posts started changing randomly. What sounds like a coincidence is that I was in the middle of giving attribution to images on my site. All I've done today was install piwik plugin and add few attribution to flickr/wikipedia commons images. what is even more strange is that when I open the site in different browser where I am not logged in as admin (or even incognito mode of the same one) everything looks normal (though the logo downloaded to my hard drive looks like the above). I just opened media library and more and more pictures are changed (though when I click them they look normal) Has anyone encountered similar problem and knows what's going on? Am I being hacked? (it all appeared first time when I refreshed the page to see the changes in my post).