Here's a similar symptom I've been able to not resolve, but to at least identify the cause for:
In my dashboard, I am posting Threat Events in the Past 24 Hours. Since updating ePO from 18.104.22.168 to 22.214.171.124 there is always one line of threat descriptions that is blank. I can click on it and display the table of events, but I had no idea what the "Threat" was.
I finally figured it out. It is Event ID: 18000. If I go to Menu>Server Settings>Event Filter to look up the code, its not there. That is why the line item in my monitor is blank. Event ID: 18000 is supposed to be "HIPS Intrusion Detected and Handled". It USED to show up before I updated my ePO. I see this on two separate ePO servers running on two separate domains.
I just love my McAfee!