Exactly what I do....after my first duplicate post last week, I've a 2nd tab to check my post when I see an error message, usually is 50/50% that it went through.
They should put that on the Steemit Welcome Page
'When you see this glitch Transmission broadcast error, do refresh your webpage on a 2nd tab because there is a 50% chance your post could have been submitted'
haha...Up-Voted @reggaemuffin cause you mention it before I did!