From your post in a different thread.
I have not seen your reply. the ports are ok. Ive tried both ports and both failed. but with cloud's create everything works ok. As I said, after programming with create I can turn to desktop and use the serial terminal.
I've tried another pc with W10 and Arduino 1.6.2. and works ok. so it seems problem in the 1.8.2build.
sorry for opening another post
Pert responded with make sure you select the right port. He was NOT referring to the two USB posts on the DUE.
Open your sketch, with your DUE connected via the programming usb port. on your IDE Tools> port and select the port that is obvious EG Port3 See attached image
