Congrats on getting the elusive update that many worldwide, including me, are waiting for. As for the rotating circle, that usually means the app is loading and stops when it is completely loaded. Something may be happening where the loader is: 1. not finishing; 2. is not giving out a finished command to the Tizen OS to kill the icon; or 3. a new feature, enjoy. It can also mean buffering is going on. That would be Internet speed and quality of service.
These days there are way too many variables that take time to locate issues. And many times more gets broken than fixed in these updates. I would suggest doing a Power Cycle, that you should do after any and all updates, by unplugging the OC box and power from the TV, waiting 30-60 seconds and then plug in the OCB and then the power. Hopefully this will "seat/set" the update and it will work "better". Good Luck.
