1 - If I’m Signed in AND at the Greeting page, when I click “Curriculum” button, it leads me to the the current lesson’s page but as if I’m signed out;
2 - Then I click the “Curriculum” button from the Greeting page and I’m led to the Curriculum page but as if I’m signed out so I can’t see my progress.
Evidence (Reproduction): https://imgur.com/a/4DzJDod
Using Firefox v61.0.1 (64-bit)
SO: Windows 10 Pro 64-bit
I have this same problem, but a different version of Windows.
I signed out and signed back in. That fixed it for me.