System Lockdown is not working in SEPM 12.1 RU6 MP5

Hi,

For testing I've enable system lock down on some systems in Whitelist Mode. First I've collect all the file fingerprint from one system using Collect File Fingerprint utility of SEPM. Now I have enable system lockdown in learning mode. But after one day testing nothing is coming in Unapproved Application list. For further testing I've enable the blocking but it is not working, means unapproved applications are not getting blocked.

I've followed all the steps described in Symantec Knowledge base. Can anybody help me on this.