The sooner this rubbish is put out to pasture the better.
Meanwhile, the only hope TomTom have is to have better software and systems than the average map-on-a-fone. So to make it this hard is suicidal IMHO. For anyone that cares, looking at the error message it looks like they decided to implement this pile of utter gash in Mozilla's XUL (i.e. it's a pile of javascript controlling some widgets). Top choice. Particularly nice to give the user the error messages in the form of a javascript stack trace; that will help. If I still had any stocks I would be selling them.
Meanwhile Greece appears to have pulled the wool over Europe's eyes ... the 50% debt haircut, if they get away with it, would be the most spectacular heist of all time and is unlikely to ever be bettered IMHO. Hopefully Greece will be on the Western Europe maps when they are recovered to the TomTom, even if they (or perhaps Germany) aren't in the Euro by that point

Rant off.
Robin