I am having a very similar issue. Initially I could not get the ADICUP360 with the EVAL-CN0338 board to communicate with CCES. I was eventually able to upload a program, however, this process is inconsistent. Sometime it works and other times it does not. I do not have this issue with any other of the demo sketches, just the CN0338 one. I have also tried all of the recommendations listed above and can't get anything to work. When I was able to successfully load a program onto the board, I wasn't able to get good communication in the terminal software (putty). It will initiate as it should but when I type "run", or any other command for that matter, it times out. It give me half of a response and then freezes up. Any suggestions?