Just tried latest JUCE 5.4.7 and built the AudioPluginHost sample project - generic GUI displays empty window when there is no plugin editor provided (at least under Win10 Win32 VST plugins), but parameters are present. When plugin has an editor, then showing generic GUI (using the “Show parameters” command) works properly and I can see sliders etc. I don’t recall having these issues on previous JUCE versions (5.4.5 was fine I think).
Can you please provide some more detail? I can’t reproduce the problem (Windows 10, VST).
I’ve modified the JUCE AudioPluginDemo by changing
hasEditor() to return
false, and AudioPluginHost displays a generic parameter view.