Thanks for the info Ian, I've used the link to report a false positive

Despite setting up an exemption yesterday I'm still getting the Image site blocked, so I can't show the reports I get as I can't get onto tm-image.com at all, never had any issues with AVG in the past, it's even blocking images embedded on TM members posts.

I'm about to try 'passive mode' in Avast to see if that helps, (mine is the pukka paid up version, if that makes any difference)

Jon M