Why does Security Essentials search for windows event log data with sourcetype instead of source?

[alastor]

The 5.x version of the Windows TA logs data with source=WinEventLog:Security and source=wineventlog ... all the items related to windows event log data fail in this app. This is really annoying. What is the best way to fix this? Do we need to modify the TA for windows settings or is this a compatibility issue with Security Essentials only working with the older 4.x versions of the windows TA?

Thanks!