Well, re-installing the driver didn't work. There were two drivers on the Epson driver site, one was the driver alone and one had extras like Print CD and so on... I chose the driver alone. I don't suppose there was anything in that larger suite of programs that I needed.
My off-group correspondent suggests I might be able to get the carts recognized if I print from QTR instead of the Epson driver. There are some features in the Epson driver I'd miss however, like ink-level, head cleaning, etc.
My other option is use my Cone carts. Or call Epson and ask for a return. Right now their refurb page doesn't show any 1400's (I was surprised to find one, just a few months ago) but they do show refurbed 1430s.