Flickr is already offering an official tool to upload images to the image hoster. The software is supporting several operating systems and another tool made by a third party has to add features that the official uploader is not supporting to have any chance to being recognized at all.
Vista Flickr Uploader is a specifically designed [...]

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Flickr users have the option to turn off the show “All Sizes” option when uploading photos to the popular image hoster. This can have the effect that the original size of the photo that has been uploaded to Flickr is not available for viewing and download.
The api on the other hand does not care about [...]

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Some images at Flickr are weakly protected with an image overlay called spaceball.gif. Whenever you right-click the image to save it you do save spaceball.gif instead which is a 1×1 pixel image showing nothing at all. The same happens if you try to drag the image to your desktop or hard drive.

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