TaurusValueComboBox raises a TypeError because postDetach is executed before a preAttach.
In other words, TaurusValueComboBox is trying to disconnect a signal before connected it. And it fails with the new style-signal
self.postDetach()
File "/home/cfalcon/tools/taurus.git/lib/taurus/qt/qtgui/input/tauruscombobox.py", line 78, in postDetach
self.currentIndexChanged.disconnect(self.writeIndexValue)
TypeError: disconnect() failed between 'currentIndexChanged' and 'currentIndexChanged'
A pull request has been created. https://github.com/cpascual/taurus/pull/9
Fixed in develop [f77231]