SIP assertion error in QwtScaleDraw.label
PyQwt5 crashes with a sip assertion error when calling the label method from a class that reimplements it from QwtScaleDraw.
Apparently this is due to a bug in sip which is already fixed in the version of sip packaged in Ubuntu 10.10.
The fact that the bug appears in Ubuntu 10.10 may indicate that the sip version used to produce the python-qwt5-qt4 package is different from the sip version shipped in Ubuntu 10.10
The problem could probably be solved by recompiling against a newer sip (e.g. the one ubuntu ships).
I also attach the apport report.