The NextGen device ships at the wrong screen density for the Genius POS. Setting it is a required install step, not an optional tweak.
Set the density after running the MB5500 FW and Enable MultiClient Input utilities, and before you log in to the POS. If you skip it, the CFD and NextGen screens will not display properly.
The device restarts with the new density applied.
If a live site has a CFD that looks squashed, oversized or cut off, check the density before anything else. Changing it requires a reboot, so do it between services.
Source: Global Payments NextGen Best Practices. Newly built article, pending review.