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Canio A. Caputo
Clicking the Check Challenge Button is Not Working
I'm clicking the Check Challenge Button and nothing is happening. Yes I'm logged in. Yes I'm signed into my developers edition. I have cleared my cache and cookies. I have tried from a different workstation.
Try slecting the different options and check the challenge...then "check challenge" got worked...
Saleforce should look into this issue
I too faced with the same problem.
The simple solution is to logout and login again.
I think there is some auto time out setup configured in the trailhead.