The manufacturer, WizardWorks Group, has acknowledged the bug in the application.
Customer should contact them at 612-559-5140.
Although there is no current fix, as a workaround, customers may use the size selection from the pop-up menu on the ribbon bar to select 9 point size.
Note: MacPublisher ships on the Small Business Macintosh 6500 and on the Small Business Macintosh 4400. Both models will be affected.