This may be a long shot, but have you updated your kernel and world a few times without using mergemaster?
I was sloppy with updating for a while, and some of the files were not changed (i.e., no mergemaster). After some cycles of this, my em interface stopped working. It was no big deal, since the board also has an fxp on it.
Later, when I updated more carefully, lo! and behold! em started working again.
Moral: use of mergemaster is strongly recommended.
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