Siri can't find my addresses anymore!!

Since updating to iOS 6, siri can't find my addresses anymore. For example, 'remind me when i get to work to email ...'. Now it says 'I do not have a work address for .....'. When I look at my contact details I do have a work address and when i tap on it, it does work with the new maps app. This is the same with all my addresses with Siri. eg. 'take me to Mum's' and i get the same reply, 'i do not have an address for mum.' What's happened? I've looked through every single setting!!!