2.5 VSE: Edited video doesn't render

Hi, I’ve been editing some video in Blender and I’ve run into a problem. When I tried to render it, all it gave me was a “No camera” error message. I went back to the 3D view, added a camera, came back to the VSE, and tried again. This time, it started rendering the background of the 3D world. It seems like Blender doesn’t understand that I want to render an edited video instead of an ordinary animation. I’ve never had this problem before and I can’t figure out how to replicate it.

So I need either a solution to the problem, or a way to move the video, audio, transitions, etc. from the problem file to a new one that works properly.

Any help would be appreciated. Let me know if I need to clarify anything or give more details.

Make sure that in the render panel–>post-processing–>sequencer is enabled.

Thanks, that worked! For a moment I was afraid I would never be rid of this wretched iMovie '08.