App switcher (command-tab) disappears

At random intervals my app switcher will misbehave. Sometimes it reuses to show at all when I press command-tab, although the app switch still takes place. Sometimes it will show on screen but there will only be one or two apps in the list even though I may have 10 open.
Anyone experiencing this?
10.6.1. Been doing it since my initial install of 10.6.

How random? Can you work in Safe Mode for a while to test? (It will take more time to startup in Safe Mode because it runs a directory check.)
-mjfor a while to test?

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