/powers/prayers/._healing
There is nothing in that directory named that in the default lib.
My wild guess is that either someone made manual backups
by putting a dot and underscore in front of the filenames, or
perhaps you use an editor that automatically makes backups
formatted that way.
I don't know what you mean by downloading the folder, but
maybe whatever you used to do that downloading created
these dot files.
Whatever the case, I cannot reproduce this "massive bug" on the default lib.
See if it happens when you install the mud following the instructions.
-Crat
EDIT: I *could* probably reproduce it if I renamed spells to have filenames
that began with "._" but I'm assuming you aren't saying that "when I rename
my spells to start with "._" they don't work!"