Ok so to start off, how do I “refresh” my traktor collection so that duplicate entries (from moving files/folders around) are removed? Is it a simple matter of deleting the .nml file and reimporting everything?
If you have been moving files you will have a lot of missing entries.
Run Consistency Check (from the Track Collection) and delete missing files.
Warning this will delete any files that have become accidently moved. You can choose to delete files from the collection rather than the Hard Drive so you dont lose any files that you dont want to.
Removing duplicates is not easy, depending on the amount of files you have.