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Mark RootMark Root 

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

We are now getting the following error when running one of our AppExchange apps on the Summer '17 sandbox preview.  All we've done is create a Visualforce page that references a component in our managed package app but none of the resources are loading.  Even adding a CORS entry does not resolve the problem.  All critical updates have been activated for the org and nothing has changed in our code.  Reverting to API version 39 for the VFpage does not resolve the issue, either.  Is there a bug with the Summer '17 release?

ERROR: Access to Font at 'https://rmhdsm--dev2.cs41.my.salesforce.com/visualforce/{snip}journal.ttf' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
David Dean 9David Dean 9
Hey Mark, did you ever figure out what's going on here? I just bumped into this exact problem.

All of my other resources seem to work properly in a scenario just like yours, but some font resources are throwing browser errors exactly like the ones you're getting.

Did it just turn out to be some simple mistake? If so, could you share what it was? Thanks!
patricia wildpatricia wild
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