Most metadata should be saved in the files tags (by default), but Play History and Playlists will be lost (MMA may have enough of both for synced files/Playlists). Also some settings and Podcast subscriptions will be lost.

A sync between MMW and MMA when allowing sync from device to PC should sync back relevant file information and Playlists. However AutoPlaylists remain lost as MMA uses them as static Playlists.

Ok. But what exactly is lost?
I have my playlists synced to MMA, and my folders with my tracks intact and their metadata (hopefully).
Is this the right time to upgrade to MM5?

No, once it is malformed it is done for.

This is not good at all. Must be a way to debug de file? Open a support ticket or something?

No, only a backup would help: https://www.mediamonkey.com/support/ind ... -malformed

Hi,
My DB suddently got error like:
Could not retrieve data "Select ID, Name, View FROM Views
Order By ID
database disk image malformed 11,11

Is there any hope?
I sadly do not have backup available.
I'm gold user.