<img src="/~img_folder">
Leo has private messaged me about your HFS site, according to the Web console, you have a "~" chacter, in which i believe is preventing you form accessing the folder path for your images.
eventual hfs does load the picture: .net:192/~img_folder I think the "~" is a programming Break that is stopping hfs to going to the folder path to get icon for images...
my next question would be, if you temp close your current hfs, download the new version put it in a another folder and re add the files to test, do the icons reaper? or do they take forever to load like this HFS is doing?