iOS Three20 : shadow doesn't work correctly on SDK 4

Today i just installed Iphone SDK 4. Then i run the TTCatalog sample application of Three20 project. It seems that the shadow doesn't work correctly on the Styled views, when the target is 3.2 or 4. But there's no problem when run it on SDK 3.1.2

Anyone got the same problem ?

Fixed according to here : http://github.com/facebook/three20/issues/closed?authenticity_token=81bd5d471e7545bb0ed1f361249bb734fbf5a44b#issue/158