Wondering if anyone can help me with this.........

I've got an '05 A4 with SatNav+ DVD (2005 Edition) but can't for the life of me figure out how to get the TMC (Traffic Management Channel/ Carrier) data to work.

My son has a Toyota with an older CD based sat nav system and it works fine on his providing traffic info and offering rerouting as required but on mine the TMC icon is ALWAYS crossed out despite being switched on (it also looks blue rather than green/red but that could just be my eyes!)

I've looked through the settings and can't actually choose a TMC channel manually but "auto" is selected and I get the TP Memo recorded messages.

Having scanned through this and other forums there was lots of people seemed to be saying there was licensing issues with previous versions of the DVD but these were supposed to be resolved for '05 edition.

Anyone got any ideas ?