Our system admin recently added a few new users to JIRA OnDemand (or Cloud or online or whatever it's called now). None of the new users can see any project or issue, even those issues that are assigned to them. It is as if they do not have Browse permission.
However, the new users have been added to the Developers role. They are not members of the Users role, but are members of jira-users. The project is using the Default Permissions Scheme, so Developers should have all of the usual, default permissions, including Browse.
What else might be wrong? What other configuration problems could I (or our system admin) check for?
Here is what one of those users sees when she logs in:

and this is what she sees if she goes to a URL I provided her to one of the issues assigned to her:
