When depth of an ultrasound image is changed the geometry does not update correctly and keeps the old depth.
Look at mitk::USTelemedImageSource::GetNextRawImage()
there it updates the geometry, but 20 frames after the change because it takes this time until geometry adapts.
If I change it to 60 frames it works for me and the geometry adapts accordingly to the choosen depth. But apparently this is not a good solution because it works only for me.