With a 3.5.9 kernel, idmap fails to resolve some UIDs but does not generate the error messages the 3.9.x kernel did.  This may be a configuration issue however as I did see an option relating to idmap.  It would be good to get it to work because it does significantly reduce the load time of web objects.  Faster is good because Google gives a higher ranking to faster servers.

     So I’m going to go stare at configuration options some more, make some tweaks and try again.