In this render i used only one machine as slave. and maps folder was shared and mapped.
network traffic is very low also (since only 2 machines running on 1Gbps lan)
in one case i had 4 machines as slaves and 2 slaves rendered fine (u can find out with the buckets rendering with machine names on it)
this time i used only one machine and till 65% it rendered fine after that the problem started
in this case IR and LC calculated fine.
maybe u r right with the textures missing. but i don't find any reason for the textures missing !!! (i collected all the textures, IES, Proxies to a folder with the max file in it corrected the path to textures so as there are no sub folders for textures)
let me try with baking textures. wish me luck!