Hi,
I use Juce Plug-In Host for quick testing plugins, but when I upgraded to new version of Juce (4.3.0) and build Plugin-In Host, I find out, that loading of filtergraph doesn’t work correctly for VST3 plugins which has set Plugin Channel Configuration (for example {2,2}) in Projucer.
The way to configure your plugin’s number of ins and outs has changed with 4.3.0 and the documentation is lagging behind… A few of us got thrown off guard with that.
Check out this thread. It got me going and now all is well.