I switched to Avast from Avira for this very reason.
Avira exclusions would not work !!!
But ever since I installed Avast, the Exclusions have NEVER worked.
Very frustrating because I use VideoFixer to repair corrupt AVI files and it always find a virus in VideoFixer, as has every antivirus program done for years.
But it is a False Positive. I even reported it in the form to Avast as a false Positive and it is till being scanned.
I excluded the entire folder and the file itself - to no avail.
As a programmer, I would think implementing exclusions would be a simple matter. And if they suddenly stop working, then the fix would be simple as well. Not sure why Avast does not quickly post the fix in an update but I don't work there so have no idea.