Adobe Reader - issue with readability of files

Hi everyone,

i´m facing many issues with readability which is the same across many users and clients.

This issue is not after any significant update. 

Users are using currently newest version of application - 21.001.20142 of Adobe Reader

As you can see on this screen some parts of document are totally unreadable. 

Also file uses local fonts and if we're uncheck this option it's even worse.

Please help i went all forums and tried to find solution but none of them worked.

This number of users with this issue is growing up every day and we don´t know why.

Thank you so much. 

Ondrej.