Isn't Debut.Print a VBA tool? That is usually not used in iLogic rules. In iLogic rules, we have the iLogic 'Logger' rule object for writing entries into the iLogic Log window. We can certainly have the VBA window open while we run macros from it, and watch stuff happen in Inventor.
Or, were you maybe using Visual Studio, with it connected to the Inventor application at the time?
I do not recall having that ability. I do know that we can have iLogic Forms open on our screen, and either a rule already running in the background, &/or buttons in the form for running rules, and being able to watch the iLogic Log window while that is going on. And I have certainly right-clicked external rules to run them, or clicked on their buttons in the ribbon to run them, and watching the iLogic Logger window while it ran.
Wesley Crihfield

(Not an Autodesk Employee)