perhaps the problem is the bitcoin application has not fully collected the latest block chain
At the bottom of the bitcoin application it should state how many blocks it has received from the network. At the moment of this post the block count should be 136841, but with your transaction it can be around 136700 and still show up. If the block count is less, the client is still collecting the block chain, and should eventually retrieve the block with your transaction in it (the number should be increasing).
If it has got the full block chain I recommend you restart the bitcoin application with the -rescan option, using command prompt with windows or terminal with Linux or mac (I'm no mac user so correct me if I'm wrong)