FWIW, it looks like the webmaster found a solution to the problem at the pcmech site.
Which seems to confirm a good detection by the web shield once again, on an injected iframe.
This injected iframe seems only effected IE and not firefox which I use as my default browser and which I won’t use to investigate possible malicious sites.
Yeah, it seems to have affected only IE. Version didn’t matter either, because when it started, I was using Maxthon with IE7 and it did it, then changed to Maxthon2 with IE8 and it still did it. Firefox didn’t have that problem though.
I really was beginning to question whether it was a FP in Avast, but at the same time I found that hard to believe since that was the only site that was making Avast scream. Looks like Avast wasn’t crazy after all. ;D
Congratulations to avast team!