I think I may have uncovered the cause for the bizarre behaviour observed with Fedora 4-64 installed on my AMD-64 PC. There is a "wrapper" required to allow 32-bit Linux applications to run. Here's a quote from Ubuntoo-

"the linux32 tools allows 64bit systems with support for 32 bit applications to set the execution domain to the 32 bit native type. For instance, on an ia64 machine, commands run with this wrapper will think the machine type is i386, as returned by uname -m."

So far, all I've managed to do is to try and determine if an -RPM version of this thing was already supplied by Fedora, so I searched Red Hat's repository for an equivalent, and once I found it, I tried running an install command. It responded with "already installed", although with Linux that doesn't always mean much- there's often a lot of fussing involved to getting things from being installed to actually working.

I think I'm close- with a few hundred more keystrokes, I might just get there!

Dave