3D FlipBook - Error: "Bad end offset: 7649580" - PDF not loading

As several others have reported, my client is having an issue with the PDF embeds not always loading properly. I did notice that when I use Chrome's Developer Tools to disable cache, the PDF embeds load fine, but when I close Developer Tools and view the page as a regular user, I get the same "Bad end offset: 7649580"

I cannot share the link of the site here, so I sent an email to author@3dflipbook.net last week on Monday, March 3rd with info and credentials but have not gotten a response yet.

Please advise.