Well I don't mean to insist that you tear open your brand new lcd that should be working from the factory, but I just happened to read this thread and it would feel wrong to not take the time to post a link to this:
http://www.mp3car.com/vbulletin/lcd-...uch-panel.html
Hopefully you can get it replaced, but it seems that way too many of these cheap touch panels suffer from this problem.