Issue: Group page permissions

I'm struggling a little with the group page permissions.

Currently no pages are protected to be only read by group members.

However, if I visit a group of which I'm not a member, I see the "This group has no pages" message. The group owner confirms that he sees the link to his start page instead.

Conversely, I see the link to my start page on a group I own, but others see the "This group has no pages" message.

Since the pages have not been protected via the Protect tab, should not everyone see the link to the start page? And even if there was a reason they lacked permission, should not the message say that, instead of saying the group has no pages?

As far as I can see, it's handled by the conditional $threadinfo['threadid'] though I don't know what that is, exactly. If that, post link to start page, else if not that post "no pages" link?