No, it started happening quite some time ago & so I wouldn't know how far to go back - don't really want to go down that route.
I've tried the site on a different computer & it worked fine so it's not the site.
I honestly can't see anything in relation in McAfee, as I said I've disabled parental controls (even though it's only keyword/image blocking). The other options in McAfee are Firewall, virus protection, spam filter, personal information protection, password vault etc nothing to do with it.
Absolute mystery... I'm out of options...