Unable to Type into Calendar Wizard

Using Calendar Wizard add-in, which I have used for many years.  This year,however, after I create a calendar (each month a separate page), I am unable to type anything into some, but not all, individual days.  When I try a black line appears over several rows and I am able to add text into those rows.  Not sure if anyone here uses Calendar Wizard, but if someone does, help would be appreciated.