Updated images in Resource Manager not displaying

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We have updated some images related to "Category" items, and included the new images into the Resource Manager.  However the end-users are not able to view the images, from the Course Catalog.  When the end-user views the Course Catalog, they view a lock image.  When I log in as an Administrator, I am able to view the images.  I have uploaded the images in the Resource Manager, into my personal files, the Learn Center and Global folders.  I have checked the permissions, widgets, and resource manager, any thoughts?