I have twice finished level 1536 and will NOT go to next level. First time game crashed after it finished. Second time, I closed the window instead of spinning and didn't go to next level. WHY NOT?
If the game crashed and then you closed the window and it didn't recognise the win then there isn't much you can do apart from go back and play the level again. There's no other way to progress other than to pass it and have the game recognise it.