clients disappear

Hi,

I'm a newbie on this forum and with SEPM.

I manage SEPM 12.1.2 on Windows 2003 since several weeks with 31 clients. All works perfectly but yesterday all my clients were OFF line.

I restart the server but nithing change,  so I decided to rebuild the database as shown on this procedure of Symantec :

http://www.symantec.com/business/support/index?pag...

Ater the rebuild, the clients were now appear  ON line on the main screen (Start icon)

17 are ONLINE and 14 are OFFLINE but it's normal

but when I go on the client icon, all my client and my groups disappear !

I upgraded to 12.1.3 version of SEPM but it has not changed ...

How can I recover my groups and my clients ?

Thanks so much