Yes I've seen that with some levels, it seems if you lose the level enough times, it finally will give you a board you can win. I hate when I mess up a good board like that! Then it's back to losing again until a winning board comes up again. The second time, I'm much more careful and make sure I win it. Much as I hate…
Believe it or not, I actually passed the level right after I sent the developers a nasty email threatening to delete the game and accusing them of being unethical with their "new enhanced game play". My big foot in my big mouth lol!!
The problem with level 523 is that it now gives only 4 bottom rows instead of 5 as all the videos show. This makes it impossible to beat even with bonuses. This needs to be fixed.