Wirelessly posted (iPhone: Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_2 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5G77 Safari/525.20)
My guess, without seeing error messages, would be that you have a corrupted preference file. Go into the library and drag the current ones to the trash and restart Safari to let it recreate them. You will have to reset your settings when you do this.