Page parts not visible

If we look at the display of the Role Center page generated by this layout again, we will see a chart (Trailing Sales Orders), followed by two list parts (My Items and Report InBox). The My Job Queue page part does not appear. This page part is defined by the developer, with the Visible property equal to FALSE:

This causes it not to display unless the Role Center page is customized by the user (or an administrator or a developer) and the part is added to the visible part list.