Rekordbox 5's file path to tracks is case sensitive! This can disrupt your workflow.

For operating systems like the Mac OS and Windows it really doesn't matter if a file path contains upper or lower case characters. The path will point to exactly the same file (or track in our instance) regardless of the path's casing. so a track with the path

‘/SSD/top40/Track.mp3’ points to the same track as 
‘/ssd/top40/Track.mp3’ points to the same track as 
‘/ssd/Top40/track.mp3’ etc.

Most apps like iTunes and Traktor and Serato are rather sloppy and sometimes make uppercases out of every subfolder in a path and sometimes leave the notation of a file path identical to how the Operating System reports it. To capitalize folder names in a file path is regarded as “clean coding” and is part of the same discussion as the use of tabs vs spaces.

Rekordbox identifies a track internally by it's absolute file path.

With previous versions of Rekordbox this was only an issue if you had for some reason formatted a disk with case sensitivity enabled.

Because Rekordbox 5 is all of a sudden case sensitive, it will not recognize tracks whose file paths only differ by casing as the same track but rather as different unique tracks. All tracks in the example above are treated as uniquely different entries to the collection. This causes duplicate entries in the Rekordbox collection which still point to the same track. And it can cause cues and loops not to appear where you expect them to be, because the file paths have different upper/lower cased character(s).

I’ve made a video to demonstrate this phenomena at https://youtu.be/PY1aQjzXxco. And some hints how to prevent it. This is not truly a bug in Rekordbox 5, more of an un convenient departure from how things worked prior to version 5. And a brand new source of confusion.