I just bought 4 copies of the game.
I have verified that all 4 computers have a NEW, fresh install.
I have verified that each system has a different serial key through Impulse.
Impulse and Sins Trinity have both been updated through Impulse, on all systems.
All versions of the game show version 1.011
And no matter which of the computers tries to act as host, the other three computers have this error message:
"Your mesh files differ from the host's. Ensure you and the host both have the latest update."
Any ideas on how to fix this?