[PyQt] houdini - pyqt scripts stopped working!!?

[stephen76]

Hi,
A number of my old pyqt scripts have stopped working.

Basically I am following the example from ..
http://www.sidefx.com/docs/houdini11.0/hom/cookbook/pyqt/part1/
My scripts used to work but now when I run the line
app = QtGui.QApplication(['houdini'])
Houdini crashes with the error ...

houdini: cannot connect to X server

I am running centos 5.5 and I guess something in my environment changed, but
I am not sure what!
Any ideas where to look?
Thanks in advance!
Stephen
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