InDesign Disappearing Act on Leopard: Resolved
The issue where InDesign CS3/CS4 can either not be hidden or cannot be unhidden using the Cmd-H keyboard shortcut on Leopard has finally been resolved!
The Apple OS X 10.5.6 update (released in December) fixes this issue.
For more information about what this is all about, you can look at this TechNote: InDesign fails to respond to show or hide commands or disappears while its process continues (Mac OS X 10.5-10.5.5).
If you haven't already done so, run your "Software Updater"; it's a hefty 377MB download, but hey, it also improves the performance and reliability of Chess. ;-)