Hi Tony!
If you WANT to single-step (using "Step into") through functions that your script calls, then the VBS file containing those functions should be open in the DIAdem-SCRIPT editor. When you "Step into" those functions from your script, the DIAdem-SCRIPT debugger will display the file and show the yellow execution-arrow for you.
If you DO NOT WANT to step through those functions, then don't open that particular VBS in DIAdem.
I hope things are going well for you and Jacob!
David Mc.
NI Applications Engineering