EM 10.2.0.5 has'n send notification since Mrch 5th

Hi, we have Oracle EM grid control version 10.2.0.5 and database version 11.1.0.7 and since March 5th it has'n send any messige.

1* select * from dba_jobs
SQL> /
       321 SYSMAN                         SYSMAN                               
SYSMAN                         13-MAR-12 09:54:22                              
                                           13-MAR-12                           
09:55:22                             152529 N                                  
SYSDATE + 1/1440                                                               
         0                                                                     
EM_TASK.WORKER(1);                                                             
NLS_LANGUAGE='AMERICAN' NLS_TERRITORY='AMERICA' NLS_CURRENCY='$' NLS_ISO_CURRENC
Y='AMERICA' NLS_NUMERIC_CHARACTERS='.,' NLS_DATE_FORMAT='DD-MON-RR' NLS_DATE_LAN
GUAGE='AMERICAN' NLS_SORT='BINARY'                                             
0102000000000000                                                          0    
                                                                               
       305 SYSMAN                         SYSMAN                               
SYSMAN                         13-MAR-12 09:18:21                              
                                           13-MAR-12                           
10:18:21                              74579 N                                  
sysdate + (1/24)                                                               
         0                                                                     
EMD_LOADER.ROLLUP();                                                           
NLS_LANGUAGE='AMERICAN' NLS_TERRITORY='AMERICA' NLS_CURRENCY='$' NLS_ISO_CURRENC
Y='AMERICA' NLS_NUMERIC_CHARACTERS='.,' NLS_DATE_FORMAT='DD-MON-RR' NLS_DATE_LAN