Literally right after I posted that, I got 3 stars in the new minigame. It's not easy, and I haven't touched it since then, but it is possible. They also seemed to give me 7 days of premium for completing the 30 days log in bonus and getting the white shirt. If anyone else can confirm that, it's something nice to look forward to once a month.
I had the same issue. I changed web browsers and it worked fine. Not sure what's up with that.