RE: realtime log mode does not work!!

I have several Quintum, one of the Quintum gives “Event Log Pad Field is Invalid!” error after I reset!! when I go into the realtime log mode. I reset the Quintum to factory default and issue the command ev +ch, but it still does not work! Althought the Quintum works well, but without the realtime log mode it is very hard to trace info when test with other vendor. Can another helps?