To remove angles in IFOEdit click on "VOB Extras" and select "Remove IIvu/angle point", then select the angle you want to keep. NOTE: Some people have to use an earlier version of IFOEdit under Windows XP because in the last several versions this feature was "broken" I know 0.91 works under XP.
After you re-encode a movie with CCE before you strip the angles out you will have scenes in the video that "replay". If this is the case, I hope you still have your original, as the video is now longer than the audio and you will need to reencode after you have stripped the angles out.... (I don't guarentee that this is your problem, it just sounds exactly like what happened to me. At least I still had a copy of the original!!!)
All very well, angles and all that, but I still have the error message with movie with one video stream (no angles). I think sometimes it is possible to have video/audio/subtitle files which are not 100% compliant with what IfoEdit expects. I have found that if I 'fix' the files before I use in IfoEdit, e.g. Besplit then I do not get the error! It would be helpful though if someone could actually explain the meaning of the error. Thanks Paul