your not alone bro.
This happened to me as well (since January I believe) I removed my cookies, cleaned my cache and the problem went away temporarily. but now its reared its ugly head again.
Its frustrating because you leave a nice long detailed message helping someone and then "Poof" ! its gone.
But I know once I make an edit to a previous comment, hit "Reply" and the comment disappears. its as if you never posted at all.
Good way to delete comments I guess
Only happens to me upon editing a post. And its not all the time either.
It is probably Cakewalks Spam filter or cookies, cache, browsing history. I don't know.
Are you using Internet Explorer ? Firefox ?