Hi Guys ... The site has not been hacked. Google mistakenly deemed our ad code as "malicious." It's the same ad code we've been using since the forum was set up.
When this warning originally came up for me, I submitted a request to Google to reevaluate the site and it gave us a clean bill of health and removed the warnings. Once I cleared my browser cache and restarted, the warnings disappeared. Your browsers may still be hanging onto a cached copy of the page. Try clearing your caches and restarting and let me know if this helps.
Cheers,
ChrisP