I completly agree that diet is 90% of the equation. You cannot exercise away bad food choices. That said, I do think you need to maybe intensify your work outs, for myself I found that once I started running, much more intense than walking, my legs and butt started to show the difference. Also if you are weight training to not be afraid of lifting heavy and making some lean muscle mass which will burn more calories even at rest...
But hey, you lost inches in other places and that is only the beginning to losing inches somewhere else... Just be patient...