I see the same problem, on a purely local /home (so it's not NFS-related). gdm incorrectly complains about .dmrc's permissions while they're set exactl like it says it wants (and with a minor spelling error in the English dialog: "sould" instead of "should"). Removing group write permissions from the homedir "fixes" it, but seems unacceptable to me - gdm has no reason to dictate how I manage my system's groups, especially not on the level of home directories (I can accept that it wants a specific mode for its own config file, but no more).
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