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I think the only big problem you have is lack of AE knowledge.
First, you can NEVER expect to work like a video editing application, where you just press the space bar and everything plays back in real time. AE IS NOT A VIDEO EDITOR. It's an effects, compositing and motion graphics application, used for very different purposes than a video editor, It functions differently than a video editor. Particularly in the way you view your work -- you don't play, you PREVIEW. tOTALLY DIFFERENT.
I encourage you to go to AE Help and look at the section on Viewing and Previewing. There are a WHOLE lot of ways to preview that can help.
A good deal of quality time spent here won't hurt, either.....
Exactly which video on this help page is supposed to help? I have the same problem. I'm not looking learned everything before I can learn something. And, I am NOT pressing the space bar. I push play. The video sometimes stops and replays the same section but always it says not in real time. The video was created in CS5. I am using CC. I seem to see this when the original video is somewhat sophisticated in its effects and not for simpler videos. Again, I'm not looking to study everything on the help site. I am looking for straightforward help with what should be a common and obvious issue with playback.