The issue is probably related to a problem with the jre (not Vontu) not being able to read the registry properly for the time under certain conditions. 

You have to reset the time by un-checking  Daylight savings and then checking it again, at that time the registry was put in a state that was readable by the jre when we restarted the Vontu services. 

You can check out the following link for more info about the problem described above:
 
 http://techtavern.wordpress.com/2010/04/15/java-and-incorrect-timezone-on-windows-xp/
 
From this article, the workaround is:
 
 * Changing date/time manually and then changing back to original correct time.
* Changing timezone and then back to original one.
* Requesting automatic time update from time server.

Here the steps to solve the issue:

- login as Domain Administrator on the Enforce server
- Change time and disable Daylight Saving Changes
- restart Vontu services
- Change back to the correct  time and enable Daylight Saving Changes
- restart Vontu services

The following information replaces the previous workaround, fixing definitely the problem.

In November 2011 Java release this tool to fix the problem:

http://www.oracle.com/technetwork/java/javase/tzupdater-readme-136440.html

Please install the patch for Java on each DLP server to update the time-zone in java. Then reboot the servers and the problem will be fixed.

Refer to this article for the steps to run the tzupdater:

Updating timezone data in Data Loss Prevention JRE software, corrects for cancellation of Brazil DST