All of a sudden, the article images on our site, http://www.chansonkritik.de aren't working anymore. All the other images (inserted in the posts) are showing properly, only the article pictures (and pictures in the slider) don't work anymore. They are working in general, they have been properly uploaded, as we can see them. (Also, the articles are shown differently in different browsers.)
Deleting and uploading them again hasn't brought any change.
We aren't hosting on wordpress.com, but our host server is working.
We recently updated to version 3.4.2, don't know whether the problem is connected to that, but I don't think so.
We're using the "Feather" Theme by Elegantthemes.
We'd need fast help please! :-/
The blog I need help with is www.chansonkritik.de.