I’m having I think a similar problem.
This plugin has been working for years and all of a sudden it’s giving me problems. When I click on the date to open the document, it opens ether in Word or PDF but no data, (no text). I know I have the correct URL because if I copy it and past it into the browser it will open. I noticed this plugin hasn’t been updated in 4 years, too bad. With all the recent WP updates and my theme (Weaver II pro) updates looks like it all might have caught up.
Your thoughts.
Don