Problem is related to center based contour output of ImageLiveWireFilter. The FillContourInSlice seem not working correctly with contours with point coordinates in pixel center.
The problem seems to be fixed taking commented out line "pol2stenc->SetTolerance(0);" in FillContourInSlice back in.
This line is also present in the fill polydata contour example from VTK's homepage.
I've adapted the user feedback contour to be corner based thus the shift of the contour when filled in the slice is removed. It is not the best solution since some pixels marked by the algorithm are not taken into account but this way the user isn't confused about what is happening when confirm segmentation button is pushed.
[8b0cc6]: Merge branch 'bug-17341-fix-LW-tool'
2014-03-26 16:08:21 Tobias Schroeder [b985ef]
Alternate user feedback contour to be corner based
2014-03-26 16:07:37 Tobias Schroeder [a6a562]
Use setTolerance of vtkPolyDataToImageStencil