i'm testing this lcd bought from ebay also with my uno. struggled for a day and after reading the specification, i believe most of us make a very simple mistake. the voltage. u need 3.3v to talk to this unit. my uno is 5v, so i use few resistors and make a voltage divider and guess what, the display is working.
tried seeedTFT, fast, small but limited function. UTFT is great, but the program is too heavy for uno.
hope this give a tips to you.
good luck.