Say I type something in the Traktor search bar to browse through all my files in my Track Collection … nothing happens. I see “Please wait while filtering …” in the browser screen. It stays indefinitely.
Is your track folder consolidated in one place on your drive? Are you working from an itunes playlist, external drive, super old computer, or anything else that might make it really hard for Traktor to find your stuff? Is your Traktor library file path specified in the settings properly?
Could be any number of these things. The only other cause of this would be not having any music on your computer.