I uploaded an external image to a SAGE 5.3 notebook, running on Ubuntu 12.04, inserted the image in a text area, then published the notebook. It turns out a visitor who views the published notebook doesn't see that external image, although the html-code served by SAGE contains a link like 'data/image.jpg'. When logged in, users do get to see the image.
What's going wrong? Has it something to do with access rights on the server? And what should I do to correct this behaviour?
