Hi Howard,
Vision Builder supports looping. The way to implement it is to use the state diagram.
By default, an inspection has a single state.
Click the Toggle Main Window View button (Top Right of the screen) to display the state diagram in the main window.
You can now edit the state diagram and create transitions to implement your loop.
Look at the following example that shows how to implement looping
C:\Program Files (x86)\National Instruments\Vision Builder AI 2011\Examples\Tutorial 6 - State Diagram Looping.vbai
Hope this helps.
Best regards,
-Christophe