Hey @MarshallOfSound, love using your Google Play Music desktop app for Mac. Something happened yesterday, and it stopped working. It freezes on the "Loading music library…" progress bar. Did Google change something?
Sorry to hear about the trouble – internet speed can play a major factor in ensuring the app works as intended. Also, a Google Play Music account only works on one device at a time. If the internet speed is good, try reloading the app to see if it still freezes. Keep us posted!