I am working in Cocos2d-x v3.3 and Cocostudio v2.0.6.
I followed the instructions to create and load files CSB onto xcode, but it works in Windows and failed in MacOS.
XCode can not read the sub-control and show the black screen in Simulator.
Node* node = CSLoader::getInstance()->createNode("MainScene.csb");
float scale = node->getContentSize().width/m_screenSize.width;
node->setScale(scale);
this->addChild(node,1);
Please add "res" folder to the project at root level by make it as references ( blue color folder icon ).
I have face something similar when I give a try with blank scene with only one button with image as a normal button state. I found error message which is missing the image file.
One more thing. Please try avoid set scale then retest again.