Track won't load anymore inside rekordbox to the player

I'm using rekorbox for a long time and I already had this bug for very few tracks but now it's on all my library since today : 
1. When I drag and drop or right click => load to deck 1 
2. Nothing happens : "Not loaded" in red stays there
3. If I right click and "show in finder" on the track name, I can find the track on my computer and load it manually with all memories cue still being there. 

Could you please tell me where this bug come from and how can I fix it without having to manually reload all my tracks (1300+) ? 

Thanks for your help