"Invalid Printer" error when printing in InStat 3.10 and/or the printer default does not save when printing within the application

Workaround:

Set the appropriate printer as a default in the system's Control Panel.  Do not change the printer in the Print Setup dialog when working in the InStat application.

The issue will reoccur when you print from the data table and then go to the Graph pane to print.  Do not print the graph just after printing the data table.