The VideoJet Driver uses the Height Multiplier field in an unconventional way. It is used as a modifier to the selected Font to select Single, Double or Triple line depending on the selected Font. Typically a multiplier should be 1 or higher. In the case of the VideoJet driver a Height of zero has meaning so changing a zero to a one is undesirable. However, this is what SCN 4338 did in the base driver code.

This was fixed by adding a virtual method to allow the VideoJet Driver to override the standard default of one with a zero.