Yandex, which is a site that scans for malware and malicious links and is referenced by a lot of things, has flagged the Blockland forums. A few weeks ago there were a lot of topics about it because Opera automatically syncs up with Yandex. Although, sometimes it does not mark the page early in the morning, which is interesting.
But anyway, don't worry about it. And nothing you have is giving you false alarms.