Logged out of Salesforce - closed all windows - Logged in (sandbox) -
then in c9 clicked on create new Salesforce workspace - https://c9.io/new/salesforce
select Sandbox … and always get
We could not authorize your Salesforce account. You will be redirected to your login page to resolve this issue.
This workspace is not linked to a Salesforce account
Sometimes, I get the Salesforce Auth dialog - usually not - but does not make a difference.
Tried that in Chrome, FF, Safari - always same result