Guys, hello!
I ran into a problem on production: some of our players are unable to run our game, in their logs I see that the scene tries to do .addChild() a cc.Node which is undefined! On the previous line, this cc.Node instance is loaded from JSON (CocosStudio): var data = ccs.load(res.res_widgets_map_json, …);
So, I conclude, that this JSON was not loaded successfully during initial assets loading phase! Does cocos2d-js have a mechanism to check that assets loading has completed successfully or retry failed downloads?