When loading Native Apple Plugins as “Main-Out Effect” from the Mixer Menu everything works fine…BUT, Third-Party AudioUnit Plugins CANNOT be Loaded !
Every time I’m trying to load various Third Party Plugins (PSP, Waves, UAD etc.) I get a “-10867” ERROR as on the picture attached.
I think djay is up to v4.1.7 - have you tried upgrading?
Another thing that crossed my mind about your difficulties is: are you sure the PSP, Waves and UAD plugins/addons you’re trying to use have AU versions? (I think that’s the only way for djay at the current time - no VSTs etc)