===== Why can’t I run with overlays twice in a row? =====

Sorry, in an open image, you can’t.  This was by design:  Unlike HCI overlays, the original source code that was overlayed is not restored after a scenario with overlays has been run.  To prevent issues arising from loading overlays on top of overlays during subsequent runs, the simulation will break and remind users that the original image has been "corrupted" by overlays.  To run the simulation, simply close and reopen the image.

In a packaged image, there is no problem with back-to-back runs containing overlays, since packaged runs always work like opening a fresh image.