Hey!

I'm using STM with my own dialogue system right now and messed around with yarnspinner for a bit before that, so it should be possible. That error you mentioned pops up when you try to call a non-static member thru a class directly... so basically it means this:

public TempClass myTempClass; //an instance of TempClass
class TempClass{
    public static void StaticMember(){
        //this can be called directly thru the class, with TempClass.StaticMember()
    }
    public void NonStaticMember(){
        //this has to be called thru an instance, like myTempClass.NonStaticMember(), in this situation
    }
}

Within STM, Rebuild() is what makes the mesh get info from whatever string was typed into it, and redraws the mesh. So the Rebuild event is invoked when the mesh is told to rebuild. The OnCompleteEvent is invoked when the mesh finishes reading, and the OnUndrawn event is invoked when the mesh finishes Unreading (You have to call Unread() to make the mesh unread)

Hopefully this info helps for now? I have an incredibly basic dialogue box within the sample scene if you want to give that a look, but I'm not sure how much that can help with hooking it up to YarnSpinner.

Oh, since it's appearing black and pixelated, you're probably using a normal shader with UI text? Try creating a new material for your text mesh, and assigning one of STM's UI shaders to it!

STM and Unity UI text should use the same type of code to work, could you show me the code you're using? I'm not 100% what could be causing the dialogue box to empty and sit blank when you assign text to it vs Unity UI