That's a dffferent problem - same release, changed behavior?
Use Info on the components and see what layers they are on. Then check the layers and see if the components are placed there by rule.Hide/Unhide in the model tree should add and remove them from the Hidden layer, if that's the layer they are on.
If that's not it, it may be a problem internal to the model that might be cleared up by simply opening it with a later version of Creo.