Search function (filter bin content) in the project panel doesn't respond. It always dark gray, not light gray. The search function under the media browser tab runs fine. And everything else works fine: CS6, Intel i7; Nvidia GeoF 670. Windows 7/Professional.
FIGURED IT OUT. THIS happens when the clips etc you are working with seem to be imported, but aren't. This is most likely to happen with us rookies who are training ourselves on something like video2brain's terrific Learn by Video series. The gotcha is that you you can work away on this training without actually importing, thus the filter doesn't work. Just go to assets and import a folder and the filter will light up!