Chris,
That was the problem. I had a set of files, fonts.dir, fonts.scale, etc
in /usr/lib/X11/fonts/TrueType but there were no font files or symlinks to
font files. After deleting these files in /usr/lib/X11/fonts/TrueType and
doing a mkfontdir in that directory, which created an empty fonts.dir file, I
am now able to enable the /usr/lib/X11/fonts/TrueType fontpath without
breaking openoffice.
I think we should reopen Bug#168778 however and move it back over to
the msttcorefonts package. We should ask them to modify msttcorefonts to
have a postinst script which removes encodings.dir, fonts.alias, fonts.dir
and fonts.scale from /usr/lib/X11/fonts/TrueType and then does a
mkfontdir in there afterwards. That will insure that no breakage gets
left behind from older broken versions of msttcorefonts having been installed.
Jack