SunTracker is a previous version of Solmetric iPV. In some cases, the SunTracker update did not work properly.    To address this, delete the app from your iPhone (hold your finger on the icon until the "X" appears and then tap it), and then sync with iTunes or go back to the app store and "buy" the Solmetric iPV. If you go the app store route, when you buy the app you will get a pop up message saying "You already purchased the app, do you want to download for free". This should allow you to download and install again.