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Lisa SouletLisa Soulet 

Problem logging in to Trailhead Playground

Hello Salesforce experts,
I am having difficulty logging in to my Trailhead Playground for the first time.  I keep getting the following error message:

Sorry to interrupt
This page has an error.  You might just need to refresh it.  Error in defaultHandler for event:  markup://aura.clientOutOfSync [call to Function() blocked by CSP]

Does this sound familiar to anyone?  Any suggestions on what I need to do in order to actually get into my Playground?

Much thanks.
NagendraNagendra (Salesforce Developers) 
Hi Lisa,

May I suggest you please clear the cache and give a try by attempting the same in a different browser which should do the trick.

Still, if the problem persists please check with below link and follow the instructions. Hope this helps.