I don't know what the hell is wrong in it, but I have tried to comment one of my videos that I have myself uploaded there (so commenting is definately not forbidden for this video) for at least 3 weeks. Whatever I try to write in the reply/comment box, it just doesn't show up. Anyone else noticed this? Damn annoying, I don't get any error messages... and usually it takes 10-20 secs before the comment shows up but I don't mean that, now it just doesn't show up at all.

Help center says "It's also possible that the owner of the video has required approval for all comments on the video. In that case, your comment won't appear until the owner approves it." But I'm talking about a video uploaded by myself so it can't be that... or is there an option that if you reply to someone's comment you need it be approved first?