That's not a bug, it's a feature. I think. :) I tried the Scribd vacuum link right after posting and I got an error saying that the PDF was encrypted, so it

That's not a bug, it's a feature. I think. :) I tried the Scribd vacuum link right after posting and I got an error saying that the PDF was encrypted, so it wouldn't be able to show it. I think that result gets cached and Scribd just redirects to the PDF for subsequent requests.