I've got the same problem with a PRETEC compact flash card (512mo), formated in fat16 (like my fully working EMTEC CF card).
When I insert it in the PCMCIA driver, nothing appears on the workbench. I tried to find a solution, using Directory opus : the software says "not dos disk".
When I try Prepcard, the utility see the card (reference, size) but I can't do anything too.
I tried your solution (unplug and plug the pcmcia adapter, etc...the card does not appear.
ANy idea of solution ? thank you a lot.