SOLVED!!!! I'm printing! Hurray!
Apparently, it's a Photoshop problem. Not the driver. After trying everything I could think of, including working on three different computers, saving to all kinds of file formats, reducing the image to 8 bits and then flattening all the layers, the only thing that worked was to copy the image into a new image window. I think something had become corrupt with the original file.
One day lost, with only three until the installation. But who cares? I'm printing again. And, it looks great. Gawd, I love this Z3200. The quality of what is coming out is great -- exactly what I expected. Still, when you see the reality, it's wonderful. This is why I was so inspired in the first place to push myself into mixed media, because of what I can get out of this printer.
Thanks to all for you brainstorming and efforts to help.
Now, I think I'm going to have a fist full of chocolate and get working on stretching the smaller canvases. I've got a couple of long nights ahead of me.
Thank you, Sally