Why is Yahoo! suddenly changing downloaded file names to "securedownload.pdf"? How can I change this?

I receive a lot of files from clients, and it's very confusing to download ten PDFs and have them hit my desktop with the same name. Until yesterday, this has never happened. I want it back the way it was. Is there any way to change it?Why is Yahoo! suddenly changing downloaded file names to %26quot;securedownload.pdf%26quot;? How can I change this?before you hit save just change the name.