Hi,

If you want to print directly to your printer and use PLOT command, than you need to verify printer name in Page Setup. If it is the same as it was previously, than go to the MacOS System Preferences, Print & Scan pane and look at the list of printers installed on your Mac, find the name of the printer you are using in page setup in AutoCAD and verify it's settings.
If you're using Batch Publish, than very that in Publish window you selected "Plot device from page setup" option enabled, but not PDF.

Maxim