Lightroom: No photos match filter in the Library Filter Metadata tab

Lightroom 4 Library Module; Searching for camera, lens, or file type in the Metadata tab, I get "No photos match the filter". With 55K images, I should have something show. Metadata is ok when viewed in the metadata palate on the right side of the screen.
This catalog is an upgrade from LR 3.6.
Another new catalog with only 5K images shows the information that is missing in my mail catalog.
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