RuggedNotebooks - thanks so much for helping.
pdirect - RuggedNotebooks is bang on. The only thing I'll add is that you need to make sure that the User is assigned an Employee/Vendor. Do do this, go to Customize > Users, edit the user, and make sure that in Step1 there is an employee or vendor chosen for this user, and that this employee is specified as a sales rep in QuickBooks.
Paul