That is very odd. I have been using Picasa almost since it came out. I own thousands of dollars of photo editing software but use Picasa 97% of the time. None of my photos have been uploaded to the web by Picasa, ever. What it does when you download it is find all the pics on your computer for you and import it into Picasa so you can view and edit them. I don't even see an option in Picasa (current edition) to upload all my photos..