Ah, the infamous Transaction Broadcast Error...a wily beast it be, fearsome and clever as a vengeful otter with no lunch. :p
Several friends and I have been struggling to accomplish anything on Steemit because of the TBE and similar bugs. I've found that cutting my text from the box and reloading (then hitting enter on the URL bar, subtle difference) usually sorts things out. I have another tab open to see if my work loaded publicly, but if not, then the reload trick usually precedes a successful post, whether it be an article or a reply.