A public hot fix for Symantec Data Loss Prevention 15.1 Maintenance Pack 1 is at available FileConnect at the Symantec Software Downloads site.
Hot Fix 2 addresses several known issues in version 15.1 MP1, including:
The hot fix needs to be applied to the Enforce Server; it does not need to be applied to the DLP Agent.
Data Loss Prevention 15.1 MP1 customers should download Hotfix_15.1.0105.zip from the Symantec Software Downloads site.
For additional details, see the Read Me file included in the hot fix ZIP file.
This same fix has also been included in 15.1 MP2 release. For details on this and other issues fixed in that Maintenance Pack, please see the 15.1 MP2 Release Notes.