For about a week now I have not been able to get into any of my training playgrounds.
Previously, when the system was down I completed a few challenges and when clicking on 'check challenge' it would freeze.
Now I am unable to get into the playgrounds at all. Is anyone else having trouble with the trailhead playgrounds?

Trailhead Check Challenge Button is not responding back with results.

Trailhead Check Challenge Button is not responding back with results.