If you are one of the gazillion people (including me) who has moved to the Firefox web browser, you may have encountered a peculiar problem on our web pages. If you have the very handy "PDF Download" extension installed, you may get "file not found" messages when you click on the PDFs on our website, whether you choose the save or view in browser options that the extension gives you. This is a bug in the extension; the creator is aware of it, and it's on his to-do list for future updates. In the meantime, if you don't want to uninstall the extension, the workaround is to right-button mouseclick the PDF links and choose "Save Link As..." to save the PDF to your hard drive and then open it.
(Thanks to Peter Karpas for his sleuthing in tracking down this issue!)