I'm happy to post that I've got a picture out of this camera at last. Its not great at 10fps max but it is a picture. This is ZM 1.23.3 on Fedora 10.
ZM is such a whinny program, it chucks out all sorts of irrelevant error messages that have you looking for problems that don't exist when all thats really wrong is you haven't got your remote host and path and capture size setup correctly. So to save others the same frustration here's how to connect.
Remote host <user>:<password>@<IP_address>
Remote path /cgi-bin/video.jpg
Capture size W 352 H 288
These settings should also work for the FCS-1070