I have just come across this problem. I have been running TomTom Navigator 6 on the HTC Touch Pro for some time and noticed I could buy a map of Singapore which I visit regularly. When it came to downloading the map, a separate free update for HTC users was included so I downloaded and installed that as well. This turns out to be an upgrade to version 7.910 which looks great compared to version 6 but the trouble is, it no longer finds my Western European maps which came with my TTN6 nor even the Singapore map I purchased. From what I am reading here, it sounds as though I need to uninstall TTN7 and reinstall TTN6 but is there an easy way of doing this? I have so much on my memory card, the thought of having to copy it all back on again is daunting! I have not heard from TomTom support for 4 days now.