The membership system may have been compromised for WordPress, it is advised to upgrade to the latest version. Old versions of WP have an exploit that you can register, and then change the role of the user to administrator or even key user.
But yeah, the search results for Terragen are absolutely wrecked now for me... It's even bolding all the things related to drugs like those are the hottest keywords with the site. :\
I was afraid of this happening. These software systems are too widely known, and exploits are being found all the time. They really should think about more security measures in WordPress and SMF Forums. Code on the website is randomly changing too. A offset I specifically coded for the forums front page to 85px, to centre it in the spacing provided, randomly changed to 83px, and now part of the images that should be hidden are visible (red dashed looking line near no new posts icon). It sounds like some one has a backdoor into the site. Which is scary for everyone's memberships, financial information, keys, etc. This would need to be publicly disclosed if this is the case with spam of this degree across the entire site, and code changing, etc. CrisB said no one has touched the forum theme. There is no way that value can spontaneously change. Why it would be changed at all is strange, but here we are with all this stuff going on in general.