Troubleshooting event 7362 - account is not configured

Object Cache: The super user account utilized by the cache is not configured. This can increase the number of cache misses, which causes the page requests to consume unneccesary system resources.

To configure the account use the following command 'stsadm -o setproperty -propertyname portalsuperuseraccount -propertyvalue account -url webappurl'. The account should be any account that has Full Control access to the SharePoint databases but is not an application pool account.

Additional Data:

Current default super user account: SHAREPOINT\system

Notice that it SAYS that there is a current default super user account.

Now, the odd thing is that I just did this:

> $wa = get-spwebapplication -identity "myfarm - 80"
> $wa.Properties["portalsuperuseraccount"]
mydomain\spsuperuser
> $wa.Properties["portalsuperreaderaccount"]
mydomain\spsuperreader

So, the event says the current account is one thing, PowerShell says it is something else, and the text of the event says that the user account is not configured.

What is REALLY going on here?  Has anyone else figured out what is really needed here?

Thank you