Hello JPBoudreau,
From Adagio Payables, select Maintain | Maintain specifications. In the specification designer, select File | Open to open he check specification that is causing the problem. Move to the cheque body and find the two fields at the bottom of the section labelled "MICR". Delete them.
Use File | Specification Options to change the specification name.
Use File | Save as... to save the specification without the MICR field under a new name.
Try printing with this spec and see if the poblem is related to the MICR font.
Also, there are several printers of this model on HP's web site. Could you point me at the specific URL from which I could download the driver you are using? I will try and re-create the behaviour at our office.
PS. What was the printer that was replaced? Have you tried using its driver with the new printer (if it was an HP Printer)?