I ran in to a very unfortunate issue recently on Video Production. We had a new user who asked a question regarding a problem they were facing. A high-reputation user asked for a full log in a comment. Since the user couldn't fit the log in the question due to the character limit, he decided to improvise and split the log up over part of the question and four answers. The user had never posted any question or answer before.
At this point I came on and saw the confusion, so I helped the user out and moved the log over to a pastebin, linked the pastebin in the question, and deleted the answers.
Everything seemed fine until a couple days later when the user managed to figure out their own problem and tried to share his solution with us. It turned out they were answer banned due to the four deleted answers (all of which had zero score and no other bad marks on them) and one question which was open and had no votes.
Since they had no answers that they could improve and have upvoted in order to lift the ban, they were pretty stuck and ended up having to try to share their answer in the comments.
I was able to manually resolve this issue by editing and undeleting one of the deleted self-answers, and then upvoting both the question and answer in order to get the answer ban lifted, but this seems like a really bad situation to trigger the answer ban in the first place.
In this case, all indications are that this is a helpful, responsive user who is interested in sharing knowledge. In other words, he's exactly the kind of user we want to have. He made one simple error that a new user could easily make and ended up with a horrible initial experience as a result. Fortunately, the user seems to have been understanding about it, but I can see how many potentially great users would simply walk away in frustration.
Please fix the answer ban so that it doesn't trigger in the cases of deleted self-answers with zero score to help avoid penalizing people who make a one time error of not understanding how to deal with exceeding the post length limit.