Invalid Company Address
If, when attempting to Prepare Payroll Tax Forms on the Mac, you receive the message, Your company address appears to be invalid and needs to be fixed in the source application before exiling, you need to update the adress information in the Form Viewer. (The Form Viewer is the application that actually processes payroll forms.)
When in Form Viewer (the name Form Viewer is next to the little apple in the upper left-hand corner of your screen), select Company Information from the Company dropdown menu, and complete the address information. This will resolve the issue.