I ran into a rendering problem: I set up a scene to render and it went well, then I moved the camera around, found a different angle but still in the same scene, when I tried to render it, Blender kept rendering the previous rendered scene (with the previous angles). How can fix this problem? I used Cycles. I also unchecked the sequencer option under post processing
If your camera has a keyframe, that will override any future changes to your camera, unless you either set a new keyframe, or delete them. To check this, mouse over the timeline and press shiftleft-arrow. Then select your camera and move it to where you want it. Go back to the timeline and press shiftright-arrow. If the camera moves back on its own, then you've put a keyframe on the camera.
If there's a keyframe, the select the camera and in the timeline you should see a yellow line. This is the frame where you keyframe was set. If you don't have any animation at all, then you can just delete all keyframes. To do that, open the Graph Editor, press home, select everything in that panel and delete it. If you do have animation that you want to keep, then you probably know how to find the keyframes for the camera and delete or modify them.
I hope that helps!