Mine stopped working, then I updated what I had in Hong Kong a couple of weeks back but it barely worked once, then never again.
Then a few days ago a colleague actually gave me a working copy- he said the key is to keep the WHOLE program and its associated files on a USB, rather than your harddrive, and always run it from the USB. A pain, but certainly better than nothing. I've now been able to use it 2 days straight no probs so far.