Clicking on image uploaded through the post editor will show a file download box instead of showing the full-size image in the browser. We are currently working to fix this issue. In the meantime, a workaround is to make two changes to the first URL in the image tag:
1. Replace "-R" with "-h".
2. Replace the image location folder (preceding something like "s1600-R") with the folder in the second URL.
For a detailed example, go to this web page