
Launch Deeper and type your password.

Click the Exposé icon in the Toolbar.

Uncheck the "Minimize Desktop" case.
This problem is the result of enabling to "Minimize Desktop" function of Exposé. It's a known bug and it's probably for this reason that Apple has always hidden this function. To correct this problem, disable the "Minimize Desktop" function of Exposé:
Launch Deeper and type your password.
Click the Exposé icon in the Toolbar.
Uncheck the "Minimize Desktop" case.