If you restart Essbase services or Reboot the server you will loose all odl logs and starts fresh . Had you done any of these ? Yet still , you should get a log which will atleast show the event of you loggin in Essbase . Can you tell me where and how you are trying to look at the log.
No i did not restart any servers.
here are the steps
IN EAS- on Application-Right click -View- log charts.
Were you able to see them earlier or it didn't work ever ?
Are you launching EAS through web browser ? If yes what version of Java you are using ?
You need to specify the version ..
If I remember correctly . there was a bug in version 9.3.x or 184.108.40.206 version