Nook color photo display problems

[oobers]

I have come upon an odd problem. When I download photos onto my Nook Color only some will display. It looks like they are ones which I did not change the name the camera gave them. The rest are just black. When the Nook is hooked up to a computer the photos are there and can be seen by the pc. Barnes & Noble support centre couldn't figure out what was the problem. Has anyone else had this happen?