Bicycle Tag of bike

I have taken all the photos from my flickr stream and labelled them in the correct format, but now can't get the UploadToDropbox page to work. After entering the password, there is a screen which allows me to select the file to upload, but then when I click 'upload', nothing happens. Any clues?

Happy to email over if that's easier?

PM'ed. worked for me this morning though, so don't know what's up.