Google Chrome is giving security alerts for my site
 

I'm running a vBulletin forum that is triggering security alerts in Google Chrome and I can't figure out what the problem might be.

The site is ultimatecentral.com. I first noticed this a little over a week ago. This past Friday I upgraded vBulletin to the latest release but the alert is still coming up. As best I can tell my site has not been compromised in any way.

A while back I posted because I wasn't coming up on Google at all and was informed about the Digital Pointless link scheme which I had on my site that was causing that - which I had no idea about and quickly removed. But I'm still not showing up in Google.

So I'm wondering if I'm still being penalized for that even though I got rid of it back in November. Is that possible? I do run Adbrite ads on the sidebar but I've never noticed anything problematic coming up - am I possibly being penalized for that?

Thanks for any help.