I’ve tried a number of AU plugins in the plugin host example project and many of them appear blank. All that I’ve tested appear to have carbon gui’s. All tested Apple plugins are blank. Camel Crusher from Camel Audio works, and the plugins from Melda Production seem to be fine. CSR Hall from IK Multimedia appears and disappears as clicked upon, sometimes just the knob or dial with everything else blank. All of the plugins work when tested in Logic.
Also, I had to modify juce_audio_processors.cpp to reference MAC_OS_X_VERSION_10_7 so the CarbonDummyPointName workaround would get picked up. I’d imagine there’s a better way to handle it but it needed changing nonetheless.