Akki_24,
I am experiencing the same problem Lukash is when viewing pdf's with Acrobat Reader DC. I know who many others who are experiencing it as well. We are all running the latest update (19.012.20035). The workaround you provided works but this is not an acceptable solution since we do not want to expose ourselves to security risks. Is Adobe working on a resolution to this problem? I have tested other Reader versions (older ones such as XI, 9, etc.) and none of them have this issue.
Also, I have Adobe Acrobat DC Pro as well. If I uninstall Reader DC and allow the Pro version to work as my pdf reader plugin I never experience this problem. The issue is unique to Reader DC only and it is causing many users much frustration. By the way, in case this helps we are all using the latest version of IE 11 and Reader DC is the plugin.
Thanks,
JP