With Performance Monitoring turned on, Application Ratings functions as I expect.
When Performance Monitoring is turned off, when I select
All Files
Highest Performance Impact
Highest Community Usage
Most Recently Discovered
User Trusted Files
Untrusted Files,
it claims it is collecting files but for less than a few seconds then, the yellow bar disappears, Will Be Scanned changes to 100%, Trusted changes to 0% and the list of files stay the same as the previously selected.
Windows 7 x86