On macOS (10.12) in Wavelab the JUCE demo plugin’s GUI doesn’t appear when using it as VST3. It looks like this:
I saw in
juce_VST3_Wrapper.cpp that there are specific behaviors for Wavelab (https://github.com/julianstorer/JUCE/commit/df9701430a1a7b61c999d1cb5f19883c917aec00).
When removing the Wavelab checks: the UI does show up, although resize still doesn’t work well, but better have a visible UI than a resizable one I wonder if the Wavelab specific behavior is needed in Windows? Haven’t checked on Windows yet