Hello everyone, I am a very new user of the DUDU7 and I have been using TomTom GO since more than a year now, since I had my previous headunit with the car.
 
I have noticed some more problems with TomTom GO that no one has reported here, and in my opinion, they are related to the navigation widget for sure and its integration with the system. Apart from the issue that is already discussed here, the app not starting at the beginning (that I also confirm), there is also another very important bug.
Problem A: So when the system wakes up with the ignition key, TomTom Go is loaded in the navigation widget and it works fine. However, if I open the app in full screen the instructions about the next turns that are displayed on the top left of the screen are not displayed in full screen.
When TomTom is displayed through the Navigation Widget it works as expected. You can see that the instruction about the next turn is displayed here:

However, when I open the app in full screen, the instructions about the next turns disappear. Take a look here:
After playing around a bit with the settings, I have concluded that the problem is somewhere in the integration with the Navigation Widget. So I have noticed the following behavior:
- If TomTom is selected as the navigation app in the Navigation Widget, then the instructions for the next turns are displayed within the widget, but they are not displayed when changing to full-screen mode.
- If I select a different navigation app for the Navigation Widget and then I open TomTom from its shortcut, it will open in full screen and the instructions for the next turn are displayed correctly as expected in full screen. See here:  
This behaviour is common for both Normal and Minimal modes. In my opinion, it seems to be a clear bug of the navigation widget.
Problem B: Another serious problem is that once I click the home button on the status bar in order to change from full screen to the home screen (for both Normal and Minimal modes) TomTom seems to be crashing and starting again about 85% of the time. I mean, it displays the splash loading screen with the spinning circle inside the navigation widget like it was closed unexpectedly and was forced to restart from scratch...
Problem C: Just for information, there are huge bugs, way worse to TomTom when Waze is selected in the Navigation Widget and you want to change to full-screen mode. Waze works inside the widget, but when changing to full screen, I get a black screen (the map is a black image). Only the next turn instructions appear when changing to full screen (behaviour opposite to TomTom).
The only navigation app that seems to work correctly as it is supposed to during the transition from widget to full-screen mode and back, is Google Maps. I wll try also with Sygic to see how it behaves.
 
In my honest opinion, there are bugs in the integration of the Navigation Widget with the system... There needs a lot of debug to be done... Please can you make a note to correct all these bugs that are related to the navigation widget? From what I understand when we select a navigation app for the widget, this apps has troubles to be displayed correctly in full screen. It is very frustrating not being able to use the navigation apps in full screen mode if they are selected in the navigation widget...
For the moment I have completely removed the navigation widget and have it replaced with a different one (no navigation widget in my home screen). I prefer to have TomTom working correctly in full screen and then put it in split screen with a second app next to it, like Spotify/Music.
Cheers to everyone, and nice to be part of the community. 
Hopefully the devs will correct the problems we report in the forum soon.
PS: I am running the latest DUDU OS update version.