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Under the Appearance tab when in the "Application Window Switcher" page in the beryl-settings-manager, down the bottom there is an expandable set of options called "Rotating List". Once expanded, check the box labelled "Fade windows out when using ring switcher".
That fades out all windows but the one that currently has focus. What we are discussing is with that checked. (I also tried unchecking it.)
EDIT: It is might be an unintended interaction with some other setting I have, but I do not know what. Edited 2007-02-20 02:51