I am running into this issue too. I am the owner and main admin of our organization and I was able to edit the contexts within the CircleCI UI with no problems until I checked again today.
I have not made any changes to my role/rights to my Github or CircleCI accounts. I have verified that I am still the owner of my repositories and made sure all the correct permissions are set.
Both GitHub AND CircleCI state that I have admin rights to the organization, but still despite being the owner & admin, I am seeing a " To view/edit this page, you must be an organization member with push permissions on GitHub."
This is literally blocking me from pushing to production. My organization is: hipherd