It works great ! Thanks so much !
I hope there will be none of the issues although I still use alpha version 2 framework older than the code there. It seems API changes quite reasonably.
One point here is that, for so long I thought setting a content scale factor directly to “Director” should not be done as “getContentScaleFactor()” (for iOS platform, cocos2d-x) will return 1 or 2 based on retina mode enabled or not, thus it seems the function is available only for inspection to create code to be able to work on such particular device. But after I’ve known your reply, my thought twists upside down, now instead of applying a global scale factor value to all nodes in the game, I just set one point in “Director”.