I've got a Due with a TFT shield and a CTE 5.0" TFT but I can't get it to work. Demo code compiles and uploads successfully but When I power the Arduino on, the screen lights up white, then fades to black after a second or 2. I believe I've initiated the object properly by calling:
Just one.
Does it use SPI and if so did you confirm that the shield is plug & play compatible with a DUE ?
The DUE only has SPI pins on it's 6-PIN SPI connector I think.
It's a shield so it's either plug & play compatible or you have a problem.
Maybe it's the library.
I don't know anything about TFTs and never had one so I probably can't help you.
Maybe someone else can.