teTeX-beta 2.96: pdftex pk mode

When running a document through pdflatex, using PK fonts, e. g.
cmbright, I get 600 dpi pixel fonts instead of the wanted 1200 dpi ones:

kpathsea: Running mktexpk --mfmode / --bdpi 600 --mag 1+0/600 --dpi 600
cmbrbx10
mktexpk: Mismatched mode ljfzzz and resolution 600; ignoring mode.
mktexpk: Running mf-nowin -progname=mf \mode:=ljfour; mag:=1+0/600;
nonstopmode; input cmbrbx10

In texconfig the global font mode and the pdftex font mode are set to
ljfzzz (1200 dpi).

The /usr/local/teTeX/share/texmf/tex/generic/config/pdftexconfig.tex has
\pdfpkresolution=1200 and the
/usr/local/teTeX/share/texmf-dist/tex/generic/config/pdftexconfig.tex
has \pdfpkresolution=600

What's wrong?

Regards, Hartmut