I noticed this last month but completely forgot to mention it. Previously I had links to Habbox & the competitions forum in my signature and whenever I tried to preview my signature with those links in, it took me to this page. Preview is obviously fine without the links in it, so I don't know why the Habbox links made it say this.
I don't know if anyone else is having this issue, but I just thought I'd mention it in case it's something that needs mentioning.