This Note From Amazon

We have corrected the font problems in a recent Kindle update 3.4. The most recent version of Kindle software is available for download from the Amazon Kindle Help pages. If your Kindle does not have the latest software, it's free and easy to download and install the update manually by following the instructions on the Kindle Software Updates Help page: http://www.amazon.com/kindlesoftwareupdates This page also includes additional information about the features included in the latest software update. As for the navigation problem, ideally, I'd like to try some real-time troubleshooting to determine if your Kindle needs a replacement. You can reach Kindle Customer Support by phone or chat by clicking Contact Us on our Kindle Support pages at: http://www.amazon.com/kindlesupport