Some players have reported the corruption of their data. This is because a few players unintentionally inserted specific text characters which caused problems with the database. The programmers have now made changes that will restrict what text characters you can enter into any of the fields. The only allowed characters are basically letters and numbers. If you try to enter anything else, you will see a warning and can click the link to go back and remove the illegal characters.
If your data already has illegal characters, you may be able to correct them then continue, but in some cases this wont be possible. If you have followed the instructions and have backed up your data to an excel chart, none of this will be a problem.
Nevertheless, a new JAA version is being made that will apply an additional pattern type. This has been in development for a while and essentially what it means for players is higher accuracy AND simpler application because the additional pattern type will replace an element the current JAA applies. I'll post more about it closer to release date.