Hi,
I have gone through your post, this problem is faced by many specially in the begining when you are in the process of settling down in new org. Solution will not be easy to come specially if your boss is tricky one which you have to find out from your sources within the company .Let me tell you it wont be that easy either. Find out in a subtle way . Overtly dont take any PANGA with your boss because he may prove to be too strong for you. May be either your boss is ignorant /insecure and he may be feeling that if you prove too competent, to take his place subsequently. Address his insecurity , convince him that you are there to help him in the best possible way. I hope you are able to understand that overtly you have to prove your competence and loyalty to your boss and covertly you have to find out reasons of his reluctance to assign more responsibility to you.Take care of his deficiencies and I am sure that he may be having very many.Last but not the least ,be patient and never ever get angry , look for oppurtunities outside the company also but dont look for the escape route so easily. You can call me on this cell also if required-09226829191.
All the best
ColVirendra