Here's another theory.  I'm suspicious how I went thirty days without baloney "uncivil" black screens.  Perhaps there is a "blacklist" option in CC.  You get twenty nine days of perfectly ordinary comments to grade as civil or not and then on day thirty someone on the blacklist gets ridiculous "uncivil" comments that look perfectly fine as they don't target a commenter with personal abuse or some long standing harassment that you have to read many more comments than just the one you see in the grading screen or just simply found uncivil because of a ridiculous subjective standard that is beyond reason because someone somewhere was offended.