from PyQt4 import Qwt5 - produces a segfault in sip.so

>>> from PyQt4 import Qwt5

Program received signal SIGSEGV, Segmentation fault.
Python Exception <class 'gdb.error'> There is no member named ma_mask.:
createClassType (client=0xb78b30b8, ctd=0xb78c080c, mod_dict=) at /build/buildd/sip4-4.13.2/siplib/siplib.c:5502
5502 /build/buildd/sip4-4.13.2/siplib/siplib.c: No such file or directory.
(gdb) backtrace
Python Exception <class 'gdb.error'> There is no member named ma_mask.:
#0 createClassType (client=0xb78b30b8, ctd=0xb78c080c, mod_dict=) at /build/buildd/sip4-4.13.2/siplib/siplib.c:5502
Python Exception <class 'gdb.error'> There is no member named ma_mask.:
#1 0xb77026b4 in sip_api_init_module (client=0xb78b30b8, mod_dict=) at /build/buildd/sip4-4.13.2/siplib/siplib.c:1418
#2 0xb7743bde in initQwt () from /usr/lib/python2.7/dist-packages/PyQt4/Qwt5/Qwt.so
#3 0x081231b7 in _PyImport_LoadDynamicModule ()
#4 0x0806dad3 in load_module.39170 ()
#5 0x0806dd74 in import_submodule.39181 ()
#6 0x080b4b66 in load_next.39186 ()
#7 0x0806e686 in import_module_level.isra.3.39207 ()
#8 0x0812ce4e in builtin___import__.32839 ()
#9 0x08149aff in PyObject_Call ()
#10 0x0814dab9 in PyEval_CallObjectWithKeywords ()
#11 0x08158fa5 in PyEval_EvalFrameEx ()
#12 0x081842f0 in PyEval_EvalCodeEx ()
#13 0x08184e83 in PyImport_ExecCodeModuleEx ()
#14 0x0806d3e0 in load_source_module.39127 ()
#15 0x08195e02 in load_package.39220 ()
#16 0x0806dd74 in import_submodule.39181 ()
#17 0x0806e2df in ensure_fromlist.part.7 ()
#18 0x0806e71d in import_module_level.isra.3.39207 ()
#19 0x0812ce4e in builtin___import__.32839 ()
#20 0x08149aff in PyObject_Call ()
#21 0x0814dab9 in PyEval_CallObjectWithKeywords ()
#22 0x08158fa5 in PyEval_EvalFrameEx ()
#23 0x081842f0 in PyEval_EvalCodeEx ()
#24 0x08185ab8 in PyRun_InteractiveOneFlags ()
#25 0x08185def in PyRun_InteractiveLoopFlags ()
#26 0x081956be in PyRun_AnyFileExFlags ()
#27 0x08198cf9 in Py_Main ()
#28 0x0805e93b in main ()
(gdb)

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: python2.7-minimal 2.7.3~rc2-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-19.31-generic-pae 3.2.12
Uname: Linux 3.2.0-19-generic-pae i686
ApportVersion: 1.94.1-0ubuntu2
Architecture: i386
CrashCounter: 1
Date: Thu Mar 22 09:10:35 2012
ExecutablePath: /usr/bin/python2.7
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
ProcCmdline: python
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 LANG=en_US.UTF-8
SegvAnalysis:
 Segfault happened at: 0xb6fd43ba: addl $0x1,(%eax)
 PC (0xb6fd43ba) ok
 source "$0x1" ok
 destination "(%eax)" (0x00000000) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: python2.7
StacktraceTop:
 ?? () from /usr/lib/python2.7/dist-packages/sip.so
 ?? () from /usr/lib/python2.7/dist-packages/sip.so
 initQwt () from /usr/lib/python2.7/dist-packages/PyQt4/Qwt5/Qwt.so
 _PyImport_LoadDynamicModule ()
 ?? ()
Title: python2.7 crashed with SIGSEGV in initQwt()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo