I am using the latest 5.3.1 juce. Using projucer to generate my project.
However, my built AU plugin (which automatically appeared in user’s au plugin folder ~/Library/Audio/Plug-Ins/Components) cannot be shown by Logic Pro X.
But Logic can find and use my plugin if I manually copied the built plugin to the system’s library au folder. (/HD/Library/Audio/Plug-Ins/Components/)
That’s a quirk of High Sierra. The first time you build a plugin with a new au type triple you need to either reboot or move the folder out of the Components folder and back in again via the Finder.