The Logbook Pro for iPhone, iPod touch, iPad, and Android is part of the PDA Companion family of software.  PDA Companions are considered "add-only" devices meaning they are designed to add new items while away from the PC and then sync to the PC upon completion of the trip.  PDA Companions are not complete logbooks for this reason.  Therefore, after performing a Sync or initialization of your device, you will not see data in the DATA areas but you should see content in the REPORT areas showing that the data from your PC has been synchronized.

For more information please view the documentation: iPhone/iPad  Android