really curious : Rekordbox cannot find some existing tracks (while can find others in the same folder)

Hi there

**

sorry for my english, I hope you understand me as Im not native speaker.

My configuration :

OS Mojave 10.14.5

track are located on external SSD hard drive

**

I have a problem wich is really strange :

Rekordbox is finding most of my tracks (around 80%) trough iTunes as I manage my playlists from there.

For some tracks it shows the message with orange "!" File cannot be found at the registered location

All the tracks that were shown with this message are actually working in iTunes and are in the right folder that the path shown in Rekordbox...

So I tried to find the pattern between all these "missing" files but there is absolutely no logic in this problem...

For instance, two tracks bought at the same time, from the same album /artist, located in the same folder, with all the same attributes react differently. One is working the other not...

what I have concluded :

- not a location/folder problem

- not a bit rate file problem (some over 1411kbps are concerned but some 320kbps as well; or 1411 regular commercial bitrate)

- not a format problem (mp3 and WAV are concerned)

- no file with more than 100 character for the filepath name (so below the 255 accepted)

- I have uninstall Rekordbox 6 for the 5 and the problem is still the same

Three things that are really strange :

- When I locate the track manually, showing to Rekordbox the file associated, I click Open then nothing happen

- When I open a track in the folder in the Finder, it opens it in iTunes. If I restart Rekordbox, he finds the track and I can export it. The problem is that I have hundred of tracks which are not working; that would take too much time to do it manually.

- With my previous computer (Windows) I never had this problem, it was working perfectly

Hope someone can understand what I am missing...

thank you