Sometimes it takes a very long time to close the Fabric Library dialog. Why?
If you have copied any of the fabrics from the designer libraries, or if you have copied your own scanned fabrics, it does take longer for the dialog to close. When you click on the Close button, EQ looks at all the new fabrics added to the project and updates the project with the colors needed to make those fabrics. This is the reason you see more color chips when you look at the Color tab of the Sketchbook.