I have a TomTom VIA620 navigator. I run the TomTom software that is used to update the GPS's maps and software. However, I have problems with the Mac Mini recognising it. When I plug it in the GPS will see a USB connection (a symbol of a PC shows up) but the Mac and the TT software doesn't see it as being connected. Sometimes it will be recognised and I can then apply updates. But mostly it doesn't work. Just wondering if anyone else has had this problem, and if so, what did you do to fix it? Thanks.