I've been posting comments on Youtube without any problems for years. Today however something's changed. I signed in as normal and attempted to use the "Share Your Thoughts" comment box. "Public" and "post" were beneath the box, I typed in my message but "Post" was greyed out and wouldn't respond...nothing. However, if I click on reply, beneath the posts...it works and my reply appears. Simply put, I can reply but not post, can anyone help?