No Event Log

I have a PMP450 Version 15.0.3 that does not update its event log. Always blank.

Upgrading from  version didn't correct the issue.

 I have since taken the AP back down to

Cleared the empty log and it started logging again.  Seems to be resolved.

Seen it a hundred times. Event log page shows nothing, not even "event log cleared". Clicking the clear button once or twice usually fixes it. Probably event log file corruption.