cut-short analysis

I have a piping model with support members included.  The model includes the cut short function to create a prestress in the system.  When I open the LOAD/STATIC ANALYSIS SETS/MODIFY STATIC ANALYSIS LOAD CASES dialog, there is a tick-box to indicate Cut-short analysis.  After editing the dialog box, including ticking the Cut-short analysis box, the dialog is closed.  When opened again, the Cut-short tick box is shown as not ticked?

Is this a bug, or is there possibly something else that must be done to activate the Cut-short analysis?