Hi Brett,
Your mxs file simply needs to accessible from all of your machines using the same path. So either map a shared drive/folder to a common letter (so that each machine has a 'M' drive for example) or use a unc path eg. //mymachinename/folder/. If you have a common drive letter like 'M' then you should be able to ignore that message,
You have server running on all your farm machines I assume? And do they all show up in the farm list box located on the render tab? In any case try the unc path and see how that works.
Kandor
ps - It was really really nice to see my machines send and merge the file in less than a minute

That's a huge improvement over what used to take 30 minutes or more!!!
