DNH's post if for One 3rd editions that have a blank white screen.
It appears you get a screen that says "gps signal lost xxx seconds ago", which means tomtom can't find any satellites. When you upgrade tomtom versions tomtom erases where the gps satellites were and has to wait until 1) the satellites "tell it" where they are (every 15 minutes or so), or until 2) you download quickgpsfix from tomtom home.
Also, I've seen a problem with my one LE where during the first startup after an application upgrade the GPS has a very difficult time finding satellites. This can be fixed by a pin reset.
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