Check the firmware on your PCV. I have two and one downloads in to WKO+ like a speeding bullet and the other takes around 5 seconds to decide if it's going to play or not. They're on the same PC, with the same cable and the same software (they're even the same colour!!). The only differnce is that the lightening one has a much later firmware revision.
So my supplementary question is...
Does anyone know how to upgrade the firmware as that could be our answer. I've checked the SRM site for info but it's a bit vague.
Sorry to highjack, sort of.
Tony
PS: It could be a dodgy cable or port. One significantly more expensive to test than the other so try swapping the usb port for one around the back of the PC.
Thanks for your help....through a process of elimination- trying other computers, USB Ports and another PCV it turns out it was the dodgy USB cable....