Last night I was able to click the epic gear spin no problem. When I woke up to play, I hit the FREE gear and it redirected me to the loading screen. The navigation to the other sections is fine though.
I restarted the app and my phone multiple times to no avail.
Device: iPhone 7+
Time Bug was noticed: 10:15 am [ 7/23/17 (NYC) ]
Game Version: Updated to latest version as of 7/23/17
EDIT : As of the morning of 7/24/2017 (6am - NYC), when I checked the epic gear it worked as normal for me.