Importing the New Track

Today I have imported the same track without the glitch, and replaced it with the old one. I have checked the song and it is fine for the whole duration. I have swapped the tracks and made sure that the new track stays in time with my footage so that the video plays exactly in time to what it did with the other track. I am now able to continue with editing, past the point of the glitch which is where I stopped editing last time.