On Friday, Sept 4 we released version 2.55 of the Managed Switch Port Mapping Tool. It improves the wording on new dialogs introduced in v2.54. It also adds a new Used Ports section to the webpage reports.
If you have the installed version, click on Help/Check for Update or visit http://www.switchportmapper.com/ to download v2.55. If you have the USB version, click Help/Check for Update to for a link to the upgrade patch.