Browser Audio and photo

Concerning photos - to see them in a browser you have to have Aperture/iPhoto/Photos app. FC shows theirs libraries

Try moving the re-size bar:

Al

You rally need to give us some information. Are you using Photos, iPhoto, Aperture, all three? Where are the libraries? Are you using iTunes for your MP3s or are you expecting something else? Where is your iTunes library?

No way. In media browser you can see pictures only from Apple's Photos/iPhoto/Aperture library (s)

Music? It's a really strange. You should see it by default if you has something in iTunes

Where's the iTunes library?

Make sure Photos preferences is set for system photo library.

Trash preferences. Repair permissions. Reboot.

Hold both the Option and Command keys together, while launching FCPX, and when prompted tell FCPX to trash preference files. See if that helps. Also make sure Photos is configured to use its library as the system library.

do not worry, do it