I noticed that when you are in EDIT GUI mode, if you close the plugin window with its top-right 'X' button (or close the property panel with that little x), the Edit GUI button in the filetab remains in its edit state, when it should return in its normal state. I fixed this.
Another thing I noticed, after your latest commits, is that the text colours of the settings window was always black (and actually black it's too dark to see over that dark-blue background colour). I knew that the PropertyPanelLookAndFeel class would be useful sooner or later, so I used it to set the colours of the setting windows to make them more readable and adaptable to the user custom colours (being that miscPanel and colourPanel are two PropertyPanel objects).
I made a PR with these mods.
But now I have a problem: I cannot understand how to make the "Audio and MIDI" settings text colour change from its default black, because it isn't a PropertyPanel obejct like the miscPanel and colourPanel, so I cannot use my PropertyPanelLookAndFeel class for it. Can you help?