To reproduce:
Load US4DCyl or Pic3D
+ Go to the segmentation view
+ Choose dynamic segmentation
+ Select Watershed Tool
+ turn the threshold high (0.85)
+ Press preview
= Crash ….
ERROR: Watershed Filter Error: itk::ERROR: itk::watershed::SegmentTreeGenerator::MergeSegments:: An unexpected and fatal error has occurred. This is probably the result of overthresholding of the input image.