When posting a new article today, I encountered the error "Missing Posting Authority productman". After searching for answers, and trying the many suggestions posted online, I could not get it to work. I logged out and logged in again based on one of the recommendations. That didn't help.
The only fancy thing I did in the article was using Steemit's Raw Markdown to create a 2-column table. So I did a debugging session by eliminating the table and I was able to post.
By editing the post and reinserting the table, the same error still persisted. So I did one row a time, and I was successful. Adding a couple of rows were also successful. I didn't change anything in the table. This led me to believe there might be a bug in the posting module for Steemit. I hope it will be fixed once Steemit is out of beta.