Ah right, OK! Have you installed an older version of the driver, or did you simply reinstall the same driver out of curiosity? (To be honest I was ignoring the bit about switching USB ports, but I had also assumed that something was written about the driver - I have just realised that this is not until the thread's final post.)
Anyway, I'm glad to hear that you have been able to resolve the issue!
And it's absolutely not a problem - I'm more than happy to help, even though I didn't actually help that much on this occasion!