opengl shows just black screen

[petr.2006]

Hello,
after the last port selfupdate and port -u upgrade outdated
opengl no longer works for me.
I see just black screen when running glxgears
and my VTK scripts. 
What might be wrong? Thanks,
Petr

uname -a
Darwin petbook.local 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23
16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64

port version
Version: 2.2.1




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