Solved.
The problem was not with the fade from or to black.
I had a conditional statement like
if( x > 1000){SceneManager.goto(Scene_YYYY)}
that was not within the
if (!this.isBusy()) {
...
}
block.
I guess next time I should provide the entire code, although I didn't think anyone would read through 300-1500 lines.
Took me some time to find this, only did by reducing the working and non working Scenes down to a barebone construct and repeatedly trying if they still worked or not, guess thats one way to improve.
----------------------------------------------------------------------------------------
So I figured it's possible to fade in a scene from black by adding this.startFadeIn(...); as the last command of of the start method after initializing some sprites so they'll appear as the black sprite fades:
Scene_XXXXX.prototype.start = function() {
.....
this.startFadeIn(this.fadeSpeed(), false);
}
However, I am not sure about about fading out.
I tried adding the following:
Scene_XXXXX.prototype.stop = function() {
Scene_Base.prototype.stop.call(this);
this.startFadeOut(this.fadeSpeed(), false);
};
and it seems to work for some custom Scenes, but not for others.
It seems to somehow break the SceneManager.goto(Scene_YYYYY) or the terminate, or something else, though no idea what, I only know that it no longer transitions to the next Scene, if I comment the stop() out everything works fine again.
So, once again, what am I doing wrong? Thanks in advance.