We are sorry for the toruble. As described the entire screen greys out and you cant email, ptintor anything
Would you mind sharing the version of the Adobe Acrobat Reader dc you are using? To check the version go to help > About Adobe Acrobat Reader DC and make sure yoiu have the latest version 20.009.20074 installed. Go to Help > Check for Updates.
If it still doesn't work please try to repair the installation from the help menu and see if that helps.