I upgraded to Ubuntu 12.04 and got the same bug. But then I recompiled python-poppler-qt4 manually and the problem went away.
So the bug is probably that the ubuntu build of python-poppler-qt4 somehow is compiled for the wrong pyqt4 or sip library version.
I upgraded to Ubuntu 12.04 and got the same bug. But then I recompiled python-poppler-qt4 manually and the problem went away.
So the bug is probably that the ubuntu build of python-poppler-qt4 somehow is compiled for the wrong pyqt4 or sip library version.