Hi Socky; my wife has tried on her MacAir (2017) via Chrome and Brave, but neither showed the stars. She also tried on the older 2009 Windows PC laptop, via Chrome and IE, neither of which worked. Possible age factor with the PC but the Mac is new. She is guessing that the Coinbase could have a PC based preference which might be why it doesn't work on Mac. We have emailed Coinbase asking them to list Steem for trading, and have Tweeted a request as well.