I got that notice as well, several times in fact, and then it came in huge black letters instead of the red and black box. When I closed everything down and re-opened the page, it was fine again. Something that is happening is affecting the forum usability. Hopefully, it is something fixable; but until it either stops happening, or Ken can get the problem fixed, we will just all have to work around the issue. If you can refresh the page so that it opens it up again, that seems to help, or at least it worked for me.
I just posted and tagged Ken so he knows it's still happening. Yes, after a minute all is well again at least for now.
I got an email from Netflix about someone possibly accessing my account. I don't know if y'all also received that email (those of you with Netflix), but it's possible that multiple sites were attacked yesterday. I saw a news story yesterday about Iranian hackers being charged, so perhaps it was in retaliation for that.