latest pylab matplotlib not working on OSX and python 2.6.2

Hello matplotlib users,

Using the source tarball on sourceforge (0.98.5.3), having pyqt-4.4.4
working, pyobjc-2.2b2 too (for GUI), but no pygtk at all, pylab does
not work (a pylab based script simply display nothing, not even create
a window). Embedding in QT4 works fine.
even when using pythonw.

During build, everything went fine except for those two libraries, for
which some
dependencies were not fat binaries (both ppc and intel binaries). I've compiled
by hand using the following (the original compiler invocation had "-arch ppc" as
the first arg, it has been removed).

Not: I'm on OSX 10.5

Anyone with the same issue?
(note: it was working fine with python 2.5.2 from python.org)

g++ -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -g -bundle
-undefined dynamic_lookup build/temp.macosx-10.3-fat-2.6/src/ft2font.o
build/temp.macosx-10.3-fat-2.6/src/mplutils.o
build/temp.macosx-10.3-fat-2.6/CXX/IndirectPythonInterface.o
build/temp.macosx-10.3-fat-2.6/CXX/cxx_extensions.o
build/temp.macosx-10.3-fat-2.6/CXX/cxxsupport.o
build/temp.macosx-10.3-fat-2.6/CXX/cxxextensions.o -L/opt/local/lib
-L/usr/local/lib -L/usr/lib -L/usr/X11R6/lib -lfreetype -lz -lz
-lstdc++ -lm -o build/lib.macosx-10.3-fat-2.6/matplotlib/ft2font.so

g++ -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -g -bundle
-undefined dynamic_lookup build/temp.macosx-10.3-fat-2.6/src/_png.o
build/temp.macosx-10.3-fat-2.6/src/mplutils.o
build/temp.macosx-10.3-fat-2.6/CXX/IndirectPythonInterface.o
build/temp.macosx-10.3-fat-2.6/CXX/cxx_extensions.o
build/temp.macosx-10.3-fat-2.6/CXX/cxxsupport.o
build/temp.macosx-10.3-fat-2.6/CXX/cxxextensions.o -L/opt/local/lib
-L/usr/local/lib -L/usr/lib -L/usr/X11R6/lib -lpng12 -lz -lz -lstdc++
-lm -o build/lib.macosx-10.3-fat-2.6/matplotlib/_png.so