After update (to 4.2) iOS says I have “723” songs, but “iPod.app” says “No Content”

Question

I have just updated to 4.2, and the space for my music is still taken according to iTunes, and the device "About" screen says I have 723 songs, but I cannot see it in the iPod app. I assume that another sync is required to activate the content again or something to that effect?

EDIT:

iTunes can see the content on my phone and even allow me to play it. I will attach some images to illustrate the issue. My photo library was updated and seems to work. I have also tried closing all apps, which did not help.

Answer 1

To add to your own answer, you will have to re-sync with your library or reset some contents (via the correct iTunes).

Answer 2

I am speculating, that this is what happened: I did the update on another computer (not the one my music is synced to), which invalidated the copy protection of my music library, so when I plugged my phone back into the machine where my music library is stored it did the deed for me. That is what seems to have happened anyway.

Answer 3

While Martin's answer is correct to bring back the songs, but here the songs are not lost/ disappeared from iPhone. There is a way to fix this.

After upgrading to 4.2.1, the songs are still there, but by somehow the songs are not shown in iPod.app. All I did is plug-in the headphones and click the middle button to play the songs. And it did worked.

No need to re-sync the songs.

Answer 4

found the answer with the second suggestion here.

Answer 5

Re-start touch (Hold home and off/on buttons) and sync again with iTunes, bingo!