Description of problem:

Results of picking up new fonts in sawfish-ui are quite unpredictable.
It appears that this is because it writes to ~/.sawfish/custom
strings like:

"-*-URW Bookman L,-bold-*-*-*-13-*-*-*-*-*-*-*"

while something like this

"-urw-bookman l-demi bold-r-*-*-*-*-*-*-*-*-*-*"

seems to be rather expected.  At least 'xfontsel' will produce something
of that kind.

Even if fonts do change on a display (sometimes they do) results can
be strange and unpredictable.  In particular font selector drops "-r-" strings
so what you are getting may end up in italics (or will not have any effect at
all).