Like Tobias said, this seems to be a problem with the free Dropbox accounts. Ran into it a while ago and finally figured out have to use dropbox links for images that I did not want to embed in the TiddlyWiki itself. Here is a link I posted here some time ago with a step-by-step example: https://dl.dropboxusercontent.com/s/hjdhlbvya1yyppf/ec4FNmB1.htm includes audio and video examples.
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