PDF document bug

[Stephan5F85]

Hello, as you can see I have this problem with my PDF documents. Everytime I try to work in the document this pixels apear. I can't finde any bugfixes in the Internet. Do you have any clue what I can do against it?

Thank you

[try67]

See: https://community.adobe.com/t5/acrobat-reader/screen-turns-to-black-and-white-dots-using-adobe-acrob...