Zebra doesn't respond to a speed change.

When setting darkness from within Easylabel and setting a speed change at the same time, the Z4000 ignores the speed change. This is a possible Zebra Motherboard problem with early versions of the motherboard.

The work-around is to "Set Printer Darkness" to NO in Easylabel's printer configuration. This will force the printer's Darkness Setting to be what is set on the front panel. The printer will now respond to all speed changes.