Project area plans not visible in team artifacts view

Hi,

I've got a strange problem. When I create a project area plan, it never shows in the team artifacts view. About half our team can see the plans and the other half can't, and there's no obvious difference between the users. We can all see team area plans fine. The only way to find the project area plans is to navigate from the Links tab of the project area editor. If I

I'm also hitting another issue, which may or may not be related. My work items will only show in one of the project area plan or the team area plan. If I assign them to a team area, they appear in the team area plan but disappear from the project area plan. If I don't assign them to any team area, they don't show in the team area plan (as I'd expect) and do show in the project area plan. The team area is a child of the project area. What's really baffling me is that I'm quite sure I'd had work items showing in both plans a few hours earlier, and I'm not sure what I could have changed.

Can anyone suggest some things to try? I've googled and have been struggling with this for a while without getting anywhere.

Thanks,
Holly