Thread:Project:Support desk/Commons images disappeared

Hello everyone, I am using the latest version of MediaWiki, PhP 5.3.8, MySqQL 5.5.21. While until yesterday everything was fine, today the images hosted on Commons and displayed on my wiki have disappeared without reason. What remains is just the red link. I didn't touch any setting, just visited the homepage and realised the problem. The images hosted on the wiki itself are still being displayed though. What can have possible happened?