New
#21
Edge has changed in the FCU as you know, in particular in respect of its handling of pdfs.
How to use Microsoft Edge as a PDF reader in the Windows 10 Fall Creators Update | Windows Central
What's new with Microsoft Edge in the Windows 10 Fall Creators Update | Windows Central
What’s New in Microsoft Edge in the Windows 10 Fall Creators Update - Microsoft Edge Dev BlogMicrosoft Edge Dev Blog
- so it wouldn't be surprising to find some additional anomalies....
https://manuals.info.apple.com/MANUA...user_guide.pdf
opens ok in the Creator's build (pre-fall/autumn) for me.
Have you tried creating a new user for test purposes?