I had no problems connecting the X5 to my Mac. I used their cable and did not try my other spare ones. I'll try my other cables later to see if it makes any difference and will report. I am very curious to hear what you think compared to the different sources you have. Have you checked to see if your card with at least one song worked? I had formatting issues when I used my cards with music on it already, I had to reformat it. When I used their internal format function, it always worked. Anyhow have fun!
By the way version 1.00 is the latest so no new firmware available yet.
The latest FW is 1.10, FIIO released yesterday.