What ways are available to get unlimited donuts on Simpsons Tapped Out?

I have got The Simpsons Tapped Out on IPhone 5 and I have been trying but failing to get unlimited donuts. I have tried the following:

1. The Springfield Downs; and

2. Plant a tree.

I will not entertain jail breaking my device so that method I have to say is out. What other methods are available and is there a reason why the 2 methods I'm using do not work? Is there a setting that I need in place before they will work?

I'm desperate so I can then get and have all I want in my Springfield.

Many thanks in advance.

Added (1). The tip from Ash below = DID NOT WORK

Ok click buy on the selected donuts then enter password and continue with the new update this works it then asks you if you are sure a second time press NO the SECOND time it's says are you sure it will then take you back to your town and the donuts will be there FREE I work on the game here at EA know one knows this yet so hurry as it will be fixed soon and remember the second time this will work 100%

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