Well this is fun.
As the time goes by since the release of NAV2013R2, some bugs have been found. These bugs were not that big of a deal for the most part.
Now, when we get into losing data this is a different story. This means that best case scenario nothing happens and mid-to-worst case scenario you start praying you have an updated backup.
The issue briefly explained consists of:
During the development of NAV, specifically during the modification of a the tables structure of the application, if certain circumstances ocurred, the info contained in that very same table could be lost partially or completely.