Thank you all for the responses.
Andrew, the test works, though I didn't get as far as the transmit portion.
Alex, LimeSuite/Pothos was installed via homebrew, GnuRadio/GR components via MacPorts, GQRX was simply downloaded from the site. I will give building from source a shot to see what the outcome is.
Marty, no go, I'm assuming that you and Alex are on to something with there being an underlying issue with GQRX for now.