Don't forget that all of your Carrara plugins, and I mean ALL, have to be installed on each render node. I'm not sure if that would stop the render from starting, but you would end up with dead blocks or lost pixels whenever a node takes over a spot where it needs it.

Also, you don't have any screen savers or power saving features turned on on any of your render nodes do you? If one takes a while or times out, it can pretty much hang the whole setup as it goes into power saving mode.

There are so many little stupid things that can bite you. But provided you get enough nodes running, the time it saves can be worthwhile.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.