Taken directly from the Webazar website:
To run Suntime correctly on Rider 2 (with v6), One XL, GOx10 or GOx20 (with v7), perform the following actions :
* install Suntime on your Tomtom
* run it once, the screen is garbaged
* stop it by clicking in the lower left corner of the screen
* connect your Tomtom to your PC and edit the file /suntime/config.txt with Wordpad
* in this file, change the line screenadaptation none in screenadaptation rider2
* save your mods and re-start your Tomtom
* run Suntime, the screen is OK
Birdman's NOTE: Some settings in the configuration screen will not be able to be set using the TomTom because the screen will also be garbled there and there is no fix for that. However, you can edit the same config.txt file as above with the correct parameters you want to use.