Is there a known issue which will prevent users from printing either web pages or emails generated in HTML after installing AVAST pro via the Network Administrator?
Not that I’m aware of and that is over two years on the forums, avast scans content and shouldn’t block but alert if there is an infected file, etc.
What is your OS ?
What is your Browser, have you tried printing with another browser ?
What is your firewall ?
What do you mean by “after installing AVAST pro via the Network Administrator,” do you mean ‘the administrator’ account, network shouldn’t come into it ?