Thanks for being so responsive, Chris. I think that the 'view notebook' [eye icon] is too out-of-the-way to notice.

IMO a design that might be less surprising would be for clicking on the name of the notebook to take you to the read-only view of the notebook. From there you could click on something that would promote it to an executable/editable view and login if necessary.

But the broken back button on login page is a real bummer.

EDIT either it was my imagination to begin with or it's already fixed because I tried it again and the back button appears to work correctly.