The best work around is to dump AVG (I have reported the incorrect phishing report several times to AVG) and find a better antivirus software!
Yes I completely agree with Graham. If you are computer savvy enough to know that image files can't possibly be a phishing attempt then you are already smarter than AVG. And if it can't fix itself after two months of being notified how much confidence can you have in it dealing with genuine threats.
Just don't replace it with Avast which is the same software! For Windows systems, the built-in Defender is all I've used for years.
