Hello,
The issue still occurs when enabled. Can you explain what this feature does and why it might be breaking sites? All of the sites are listed as secure and having a valid certificate yet avast does not like them...! Thanks!
I already gave you an answer above.
Nobody ever explains it in detail why it occurs, on these forums. It's just a well-known thing. It's just the way this feature is implemented. It's incompatible with some sites. It always was.
You can search in Google for similar issues with avast and you'll find them.
So it's safe to disable it. Your computer won't really get any noticeable increase in chance of getting infected because of it.
In addition I want to say that majority of the components that cluttered Avast over the past years are superflous and mostly exist to make you, as a user, believe that you're getting a lot of various protections, and to try to convince you to get even more compoments by getting a paid version of the program.
In reality, File and Web Shields are quite enough to keep being proteced, and without HTTPS scans enabled.
Everything else is simply a drain of your PC resources. Especialy if it's not a super fast PC.