Stormin Mormon wrote:
My Panasonic supports SD and SDHC, but for some reason cards
over 2 GB just don't work. Go figure.

If it doesn't work with prime brand 4GB SDHC cards, I would have said that
it's either faulty or needs a firmware upgrade. Be aware that 4GB SD
cards (as opposed to SDHC cards) are non-standard, and may or may not work
in any particular camera.

David