title_body: Google Play Books unable to save margin note
upvoted_answer: Looks like my Ghostery browser extension was messing with the site. I was able to pause it and reattempt and found the notes made their way through. I drilled down into the trackers that were blocked, one was "Site Analytics: Google Analytics" another was "Advertising: Technorati". It was the Technorati tracker that was required for the GPB notes features to operate.
  
  It's a little disconcerting to see advertisements in the mix of GPB. Anyone know what the deal with that is?