system
1
I turned all shields off for 10 minutes. I then turned them on a few minutes later and the mail shield will not come on. Meanwhile Thunderbird will not send or receive email. 30 minutes ago it was working perfectly.
Eddy
2
Did you remove any (pre)installed av completely before installing avast ?
DavidR
4
Have you rebooted, as simple as this sounds it often resolved issues like this.
If that doesn’t resolve it, try an Avast repair.