What I've done and how to undo what I've done?

It was O-black-30 (this morning) and I was not paying attention to what I was doing. Somehow I clicked on something and now when I slide the time line, there is no action on the screen until the mouse button is released. I tried all combinations of key & mouse clicks except the right one. PLEASE, what I've done and how to undo what I've done? AE CS4

Thank you

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Tags: After Effects

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