When starting the "EMSegmenter with Atlas" module, using the "MRI Human Brain" task, "Simple" mode and going to the next step, the Python module crashes with the following output in Python Interactor:

Python 2.7.13 (default, Sep 4 2017, 02:22:20) [MSC v.1800 64 bit (AMD64)] on win32

[EMSegmentPy 09/05/2017 07:53:28]: Added to List Task: 'CT Hand Bone' File : 'C:\Users\ANDREA~1\AppData\Local\Temp\Slicer\EMSegmentTaskCopy\CT-Hand-Bone.mrml'
[EMSegmentPy 09/05/2017 07:53:28]: Added to List Task: 'MRI Human Brain Full Parcellation' File : 'C:\Users\ANDREA~1\AppData\Local\Temp\Slicer\EMSegmentTaskCopy\MRI-Human-Brain-Full-Parcellation.mrml'
[EMSegmentPy 09/05/2017 07:53:28]: Added to List Task: 'MRI Human Brain Hemisphere' File : 'C:\Users\ANDREA~1\AppData\Local\Temp\Slicer\EMSegmentTaskCopy\MRI-Human-Brain-Hemisphere.mrml'
[EMSegmentPy 09/05/2017 07:53:28]: Added to List Task: 'MRI Human Brain Parcellation' File : 'C:\Users\ANDREA~1\AppData\Local\Temp\Slicer\EMSegmentTaskCopy\MRI-Human-Brain-Parcellation.mrml'
[EMSegmentPy 09/05/2017 07:53:28]: Added to List Task: 'MRI Human Brain' File : 'C:\Users\ANDREA~1\AppData\Local\Temp\Slicer\EMSegmentTaskCopy\MRI-Human-Brain.mrml'
[EMSegmentPy 09/05/2017 07:53:28]: Added to List Task: 'Non Human Primate' File : 'C:\Users\ANDREA~1\AppData\Local\Temp\Slicer\EMSegmentTaskCopy\Non-Human-Primate.mrml'
[EMSegmentPy 09/05/2017 07:53:50]: Attempting to load task 'MRI Human Brain' from file 'C:\Users\ANDREA~1\AppData\Local\Temp\Slicer\EMSegmentTaskCopy\MRI-Human-Brain.mrml'
[EMSegmentPy 09/05/2017 07:53:52]: Loading completed.
Traceback (most recent call last):
File "C:\Program Files\Slicer 4.7.0-2017-09-03\lib\Slicer-4.7\qt-loadable-modules\Python\EMSegmentWizard\EMSegmentDefineInputChannelsStep.py", line 60, in createUserInterface
self.inputChannelList = slicer.modulewidget.qSlicerEMSegmentInputChannelListWidget()
AttributeError: 'module' object has no attribute 'modulewidget'
Traceback (most recent call last):
File "C:\Program Files\Slicer 4.7.0-2017-09-03\lib\Slicer-4.7\qt-loadable-modules\Python\EMSegmentWizard\EMSegmentDefineInputChannelsStep.py", line 156, in onEntry
self.loadFromMRML()
File "C:\Program Files\Slicer 4.7.0-2017-09-03\lib\Slicer-4.7\qt-loadable-modules\Python\EMSegmentWizard\EMSegmentDefineInputChannelsStep.py", line 125, in loadFromMRML
self.inputChannelList.updateWidgetFromMRML()
AttributeError: ctkWorkflowWidgetStep has no attribute named '_EMSegmentDefineInputChannelsStep__inputChannelList'

This happens every time, even if I open the module first and have not done any other interactions with Slicer.
Tested with 4.6.2 stable, as well as 4.7.0-2017-09-03 - both versions have the same issue.