Users see spinning squares when trying to load a Mastery Challenge

Sometimes we receive Help requests about stuck Mastery challenges. The page will not load. Instead the user sees the "spinning squares" in the area which should have held the mastery problem.

If this should happen to you, please try to refresh the page. You should also try to change your browser to see if it makes a difference. If refreshing does not help please send an error report containing

  • the url to the page
  • information about which Mastery challenge mission you are on
  • information about which browsers you've tried

Apart from refreshing, some users have been helped by going to the All of Math (World of Math) Mastery challenge if they were on a specific mission, or trying the Mastery Challenges in specific missions if they were working on All of Math.

Some users have been able to clear this problem in the following way.

1. Go to account settings.
2. Uncheck 'Hide visually-dependent content' under the 'Accessibility' section.

We are sorry for the inconvenience.


Ref. mastery_noload_spinsquare

Original March 30th 2015

Lat updated October 7th 2016

Internal ticket:


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