Crash with "Invalid signal signature:" on Windows

Running Spyder IDE revision 69edfdbcea0f on Windows gives the following error.

> hg clone http://code.google.com/p/spyderlib/
> cd spyderlib
> python bootstrap.py
...
03. Imported Spyder 2.3.0dev3
    [Python 2.7.3 32bits, Qt 4.8.2, PySide 1.1.2 on Windows]
0x. Enforcing parent console (Windows only)
04. Executing spyder.main()
Invalid Signal signature:

And Python crashes with c0000005.

According to
http://qt.gitorious.org/pyside/pyside/blobs/HEAD/libpyside/signalmanager.cpp#line505 the `Invalid Signal signature:` should be accompanied with signature. Perhaps the cause of the crash is some formatting error. It would also be nice (if possible) to detect Python source code line and show it as well.