As far as I can tell it doesn't read root's .dmrc but I can't tell that for sure.
What I can tell is what "fixes" the problem for me. It's removing group write permissions from my homedir (even though it's owned by the group in which only my user is in). After some testing, I noticed that the home directory may at have permissions of 755 at maximum, as soon as group or others have write permissions the .dmrc message appears. So the message hasn't really something to do with .dmrc but with the permissions of your home directory. HTH Marcel
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