[Zubersoft]

If you go to Settings->Display Settings->Render Preference, do you have it set to "Speed" or "Quality"? If you switch this setting, does the problem go away? If the problem appears when using "Speed", please send one of the files to mike@zubersoft.com so I can make the company that produces the PDF library aware of the issue. If the problem occurs with both libraries, then I may need to get a copy of the collection from you so that I can test it on my Samsung Note Pro 12.2 to see if I can reproduce the issue.

Thanks,
Mike