Components in a stream not visible to some users

I am trying to help two users load source from a stream, and they cannot. They are not new users, and can access and load source from another stream. Important characteristics:

- Their user profiles show that their repository group is "JazzUsers"
- Their client access license is set to "Rational Team Concert - Developer-Flaoting - Unlocked"
- They are a member of the team area that owns the stream in question
- The stream ownership is that team area, and the visibility is the project area to which that team area belongs.

I've double-checked everything.

But when they expand <project area> > Source Control > <stream name>, they see nothing under there. No components. When they create a workspace that flows to this stream and try to load the components, they are not presented with anything. When they open up the stream in either the rich RTC client or the browser, under "Components" they see "No Components" and under "Flow Targets" they see "No Flow Targets."

Why can this be happening? Again, they can load and view other streams just fine. It just seems to be this particular stream. I have no problem seeing the components and loading code from them.