After ProjectWise Passport is selected for checkout in the Administration Site there is no window with the list of applications covered by the ProjectWise Passport license to choose from, it goes straight away to the checkout options window. As aconsequence it is not possible to checkout a ProjectWise Passport child product.
Make sure you're not accessing the SELECTserver Admininstration Site using a SELECTserver machine alias name. If so use the hostname of the SELECTservermachine. You might also want to try using the newest Mozilla Firefoxbrowser.