We have been having issues with PDF files loading properly for awhile. We recently switched plugins to better handle these files and how they load. The plugin also has better support as it has a paid subscription program so it is better aupported.
For some reason, the PDF files stop loading or don’t load at all. It may be a conflict with another plugin or the theme we are using. It will look like it is fixed and then stop working. I may have fixed it today with disabling our old PDF plugin and updating with a theme update.
If you have issues, let me know specifics below with our comment section below. An uploaded screen shot would be great.
As always, thank you!