I've submitted this twice, with no effect. Here goes for a 3rd time!

Can you read the file now using Acrobat Reader? If you can, it is somewhere on your computer and Jack's suggestion may help. If you can't read it now, it is probably no longer on your computer - this often happens when you use a pdf reader to read a file via your browser. The file is downloaded to a 'temporary' folder, which is sometimes cleared when the computer is shut down.

I currently have 2 pdf files in my /tmp folder, which will not be there tomorrow.

Phil