I finally resolved my inability to refresh or post a new note from MarsEdit 2 to one of my Drupal sites, based on this tip. I had to enable the “Edit own stories” permission on my role for blogs in the Drupal Access Control list. Until I did that, I was consistently receiving the error:
“You either tried to edit somebody else’s blog or you don’t have permission to edit your own blog.”
On that site, I still can’t get a list of all of the taxonomy terms in the MarsEdit Categories list. Actually, I get none. I’ve at least taken on important step in the right direction, so that’s helpful.