On creating a new web app in Dropbox and following the instructions to enable third party file uploads, I see the new button on my image field labelled Dropbox, on selecting an image from the dialog window, I get the following error:

An AJAX HTTP request terminated abnormally.
Debugging information follows.
Path: /file/ajax/uc_product_image/und/form-S2SBi1BEvp4R8EKgsa5BBjSqiMa-AvlDKjmTHnJG0Rs
StatusText: n/a
ResponseText:
ReadyState: undefined

The image doesn't get sent to Drupal, but I can see an upload in the filesystem, buts its an empty & broken file. All folder permissions etc are set correctly.

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8ManJ created an issue.