Missing attachments in iteration plan

If I create a new iteration plan (thick client -> team artifacts -> project -> plans) and add an attachment to the overview page, the attachments are shown at the bottom of the page while in edit mode. If I save and close the the plan and then reopen it, the attachments do not appear on the overview tab. However, when I edit the page again, the attachments appear at the bottom.
Is this a bug? Why does the attachment only appear while in edit mode? A user without edit authority who simply views the page will not see the attachment.
Can someone tell me if this is a known bug or am I doing something wrong?

Terry