Hi Paula, thank you for taking another crack at it and for writing a full post about MASDACS.
Based on what you experienced, do you think the error is based on an api conflict happening when you have an "open post" in the Steemit editor ( as it saves as a pending draft ) and then trying to submit a post from MASDACS?
when I closed the open post on steemit I had no problems submitting, so there is a likelihood that this could be the case. Worth testing it on the dev side