I hope you know the PICNIC problem (Problem in Chair not in Computer) – it happened to me L. I get a significant amount of Spam-comments on my blog, which are filtered in the corresponding Spam-filter. From time to time I clean it up. Unfortunately I made a mistake and deleted about 5 or 6 comments and trackbacks before I realized that the corresponding filter was not set to "Spam" but to "Published" which means that I deleted legitimate comments.
I have to apologize. I did not delete a comment because I disagreed (which I never do unless you are advertising or spamming me) or because of anything else. It was just a PICNIC Problem L