I've noticed a problem with the "Download Now" button on map pages: you need to click the left half of the button for it to work at all. It seems that if you click the right half, the "next screenshot" arrow takes precedence over the download button. The arrow's click zone stretches top-to-bottom on the screenshot view, and ends up overlapping the download button.
Edit: seems the problem happens on any download with more than one screenshot.
Edit: seems the problem happens on any download with more than one screenshot.