I will publish the beta test of the update next week maybe.
But to fix it yourself, add this to the create event of control_cutscene:
effect_color = c_black;
effect_alpha = 1;
And in cutscene_fade_out, add rect = true;
somewhere in line 12, before cutscene_next();
In cutscene_fade_in, add rect = false;
somewhere in line 8, before the if statement.
Let me know if you encounter any problem.