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Marcelo ArredondoMarcelo Arredondo 

Trailhead Challenge dissapears after login to Salesforce in a Mac

After complete a lesson, when I want to start the challenge, it offers to me to login to Salesforce. After that, it makes a redirection and/or refresh of the page, and the Challenge dissapears. It only shows the title Challenge, and the number of points of it, but there are nothing below it. This happens in a Mac, with OS X El Capitan 10.11.5 beta, and Safari Technology Preview 9.1.1

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DeepthiDeepthi (Salesforce Developers) 
Hi Marcelo,

Try to refresh your browser of work on a different browser to complete the challenge. Once logout and login to your account. Hope this may help you!

Best Regards,
Deepthi
Adeline MooreAdeline Moore
Also after you login it may ask you to "launch" near the challenge. Hope this is of some help
Marcelo ArredondoMarcelo Arredondo
Deepthi, Adeline

Thanks for your answers!

It seems that the issue is related to the browser "Safary Technology Preview". It worked fine when I switched to the classic browser "Safari".

Regards,
Marcelo