I think the attorneys who have posted here have already pointed out that names registered before the granting of a trademark are safe. Looks like I was the last one in the water as all the other extensions were already registered.
I can't believe a trademark would be granted on photocenter for general usage anyhow. Both are totally generic words and there are hundreds of businesses already in place with photo center in their names.
I just checked the trademark and there is only one live trademark by UMAX that is limited to this use:
"computer software displaying, modifying and printing images from digital cameras" - in other words a specific software program they publish for this purpose. You couldn't use the name on another software program used for this purpose.
No one can trade mark the name as used for selling camera equipment, photo processing, for photo galleries, etc.