Uncheck the Move Focus to the Window Drawer' command in the Keyboard Shortcuts tab of the Keyboard & Mouse System Preferences (Keyboard Navigation group).



Background:

This behavior occurs because of a conflict with the default Mac OS X Leopard key commands. Apple changed the default for 'Move Focus to the Window Drawer' from Cmd㪛` (grave accent--the one on the tilde key) in Tiger to Cmd㪛' (apostrophe) in Leopard, which conflicts with QuarkXPress' 'Increase Leading by 1/10th Point' key command.