Seems I am having a similar issue.

Over the past 2 weeks my website which is powered by Wordpress all of a sudden started poping up Malware URL blocked.

I’ve searched for encrypted, obfuscated script or iframe but none were found.

I had the site scanned but it has turned up clean

http://www.virustotal.com/url-scan/report.html?id=f00409cfddda46427aae4ebf1842c3d2-1315045924
http://www.avgthreatlabs.com/sitereports/domain/prattephoto.com/domain-search-widget/www.avg.com.au

I’ve contacted my web host on several occasions and they report no threats to the site.

Is there a log file that can provide more accurate results as to where the detection are made as I am at a loss.

http://prattephoto.com/