It started recently. is anyone else experiencing this?

Nope, but I don't use AVG or anything else but common sense and the tools built into Google and Chrome, as well as uBlock Origin

AVG is doing this to me as well. Its a pain in the ass.

You can whitelist sites: https://support.avg.com/SupportArticleView?l=en&urlName=How-to-exclude-file-folder-or-website-from-AVG-scanning&supportType=home

You can whitelist sites: https://support.avg.com/SupportArticleView?l=en&urlName=How-to-exclude-file-folder-or-website-from-AVG-scanning&supportType=home

Whitelisting has no effect at all.

It worked for me though, are you typing in the right address? (http://forums.ffshrine.org/index.php). Also it was in AVG's settings under 'Menu', 'Settings' and 'Special Exceptions'. Before that, AVG kept throwing up a 'Threat Secured' error every time I tried accessing the site, yet checking the virus vault showed nothing in it. So I assumed it was a 'false positive' on AVG's part.

could be false positive, but history forums have being hacked, so even if not now, could be that from.

I did add the site to url exception in avg, but it still gets blocked

Same here. I had to go around the horn of sorts. It also blocks the old Timewarp theme.