Overnight from 20-21Apr2011, Amazon had some issues affecting not just their S3 but also EC2 services, which we depend on for certain functions and were causing sporadic problems with our downloads, PDF Stamping and Transaction Log viewing in particular. Our Dev/Ops staff did what we could to cut affected Amazon services out of the loop until things cleared up, and things do seem settled by now, but we're keeping an eye on the situation just in case, with our apologies for the inconvenience.