I have this same exact problem. I even tried logging out and logging back in but still no success. Really frustrating as I used quite a few of my boosters in hopes of the "great reward" promised. I would at least like to get back my boosters that I wasted if I'm not going to get any prize from all my time spent.
Yes this is so frustrating. I've won it twice now. I used so many of my boosters the first time round and now they're gone with nothing to show for it.