I am having such a headache. I have multiple sequences that are linked to one video, and each sequence is cut in bits. Problem is, one of the sequences, needs to be linked to a different video. But when I replace the video, the other sequences are affected and vica versa. It seems like I just can't unlink this video from one sequence, without affecting the others. PLEASE HELP.
Sequences are essentially a database of what we've done in sequential order. You should be able to change clips on one sequence without affecting others unless they are duplicates of the other sequence.
Then, yes, changing one of the dupes at times changes the others.
Did you create separate sequences, or make one, then dupe it?