Plugin can't find pdf files

This plugin is causing 404 File Not Found errors with pdfs that are in my wp-content/uploads folder. I know the url is correct, because I can insert the direct link into my pages and it works. Moreover, two other pdf viewer plugins have no problem locating the file. I am using WP 3.8. Here is the page I am building:

http://354democrats.org/blog/?page_id=4

Click on the Test2 tab to see the problem. Click on the Recording tab and then the link to see the pdf I am trying to show with the viewer. Click on the Score tab to see the file displayed by the GED plugin; click on the Test1 tab to see the file displayed by the wp-pdfjs plugin.

I used the WordPress upload function to upload the pdf, so it is in the wp-content/uploads/2014/01 folder. The file permissions for web users are “Read” but not write or execute. Here is the shortcode string I used:

[pdfjs-viewer url=”http://354democrats.org/blog/wp-content/uploads/2014/01/TaleSpin-Latest.pdf” viewer_width=600px viewer_height=700px fullscreen=true download=false print=false]

What is going on?