A feature that has been available in WorkVisual for some years, but that had never caught my attention until a few weeks ago, is the debug mode, which has helped me unravel some mysteries in a recent project.
It allows, with some adjustments, to see the program flow, in real time, within WorkVisual and I found it to be a much better analysis method than Smartpad's caller stack.
The video below summarizes the process well (and can be downloaded from the KUKA download center).
Just take into account that the same was done at the time of WorkVisual 4, and some things have changed since then.