Hi Maarten,
I don't think it is the cable to be honest since it's been fine before and worked okay in my friends Macbook. It's either my laptop or the latest build of Cuelux, I'll do more investigation.
Out of interest, can I download older versions from anywhere to test out my theory and roll back if that is the problem? I'm using the 64-bit driver in Win 7 too, don't think I used that before. It does recognise it as a CueCable when it's plugged in though.