Question: printers not showing up in Zebra Designer 3 for Developers

Ok, I guess this is both the first post for this sub, and also a question. I just installed Zebra Designer 3 for Developers, and the only printers that are showing up in the printer selection drop down (when creating a new receipt or label) are three generic printers. My RW420 is not showing up, even though I have the drivers installed on my system. Anyone have any ideas? (yes, I'm the only sub member at this moment, but I hope others will join. I'll update this if/when I figure out the answer.