AVG giving Threat Secured pop-ups for almost every website

Hello Jan.
Thank you for contacting AVG Community Support.
We apologize for the inconvenience caused to you.
We will certainly check and help you.
Please help us with a screenshot of the error to check and help you further.
Here is the link which has the steps to take a screenshot :
| AVG (https://support.avg.com/SupportArticleView?l=en&urlName=AVG-Create-screenshot&q=How+to+create+a+screenshot&supportType=home)
Thank you.

I've been using AVG on my PC for years now with little issues. As of today though, AVG issues Threat Secured pop-ups for almost every website I visit, even though I've visited them for years and they never gave me grief. This includes my Gmail-account, where it will issue pop-ups continuously while I'm logged in (as many as 14 in one minute!), labeling Gmail as 'infected with URL:Phishing'.
I refuse to believe that the majority of the websites I've visited for years are suddenly infected with phishing, so it must be a flaw in AVG. Any idea what causes this and how I get rid of it?

Hello Jan.
Thank you for contacting AVG Community Support.
We apologize for the inconvenience caused to you.
We will certainly check and help you.
Please help us with a screenshot of the error to check and help you further.
Here is the link which has the steps to take a screenshot :
| AVG (https://support.avg.com/SupportArticleView?l=en&urlName=AVG-Create-screenshot&q=How+to+create+a+screenshot&supportType=home)
Thank you.