If you are a Navigon user, I would encourage you not to update to version 2.0 just yet.
I've updated to this new version and am experiencing major problems.
The update installed fine. I was then required to select which map areas I wanted to download. The download took quite some time, and at various stages VoiceOver became unresponsive.
However, it did eventually complete, and I was presented with a button to start the app. On doing so, things immediately went from bad to…