this worked with a 4 finger swipe for me.

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It's also working for me. It is a shame that you can't use the gesture to change to other app by swiping down on other Dock's icon, but have to come back from Application Exposé and choose the other application. Of course, there is always the TAB trick to change between running apps.

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You don't have to come back from App Exposé. Just click on another dock icon and you'll go to that app's exposé.

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Interesting. Once you're in App Expose, you can click on any dock icon or even invoke the app switcher to view the expose for another application. But it seems no matter what you select, you end up back in the original space although with the application you'd selected active. What good is that?

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