Tarek from the MITx 6.341x course team is now unable to import under his usual username. i.e. he cannot import under email@example.com, but can under firstname.lastname@example.org. Both are Staff.
Steps to reproduce:
1. Try to import under user name email@example.com. The import is accepted, but just churns and churns for hours without the updates making it live.
2. Use a different username firstname.lastname@example.org for the import, it works fine.