|Sorry, I think I confused myself and didn't give the correct details on what was happening...|
If I have a virgin SDHC card and I first format it in the digital camera then yes, it seems to be able to be transfered to and from and to work with both the trail camera and the digital camera in which it was formatted.
If I have a virgin SDHC card and I first format it in the TRAIL camera then the digital camera asks me to format it. Doing so only repeatedly asks me to format it again. I was also unable to format it in the USB SD card reader on the computer saying that access is denied. And yes I checked to make sure the switch on it was not locked.
I could have used them just fine if I had known that I had to format the cards in the digital camera first but now that I know I need to restore it or wipe it or reformat it to the format used by the digital camera.
I've tried formatting them using a Panasonic and an HP SD Card Formatting utility and while these somehow let me format them to FAT32, neither changed the fact that they need to be formatted for use in the digital camera still and the camera still tells me that it could not read the card.
At this point I'm planning on caving in and spending the $10 USD for a new 4GB SD card. Stuff like this just gets my goat though! :-)