I gave up on Photoshelter as it doesn't seem to have a stable, working solution for posting in forums like this. Their support was useless, kept asking me for more info, in spite of several emails with detail explanations and screen shots. Certain links remain dead months after I warned them. Basically, if I wanted to post here, in this forum, an image hosted there, it offered a limited functionality (compared to, say, Flickr), and it would work only the first time. Next time I would visit my post, there would be a message "this image not available" or similar. It seems to me they are disproportionally better in promoting themselves than in making it actually work.