I stumbled over the same problem. plasmoidviewer gives a bit more information: findServiceByDesktopPath: not found Traceback (most recent call last): File "/usr/share/kde4/apps/plasma_scriptengine_python/pyappletscript.py", line 19, in <module> from PyQt4.QtCore import * ImportError: /usr/lib/pymodules/python2.5/PyQt4/QtCore.so: undefined symbol: PyProperty_Type