HTTP error

Hello,

When I try to upload PDFs, I get an “httperror” message on the right-hand pane and the document doesn’t show in the library until you close the media library and re-enter, and it’s also stopped generating thumbnails. Other media types, such as JPG and PNG work fine, but PDFs just won’t generate properly.

I’m not sure what info you’ll need in order to help me diagnose the issues we’re experiencing, but any help anyone’s able to give would be gratefully received 🙂