Who deleted tracks?
Follow those steps:
1. Login to SiteAdmin'
2. Go to System Tools (top menu)
3. Go to User Actions (left menu)
4. Set Category to "Tracks"
5. Enter "removed" in the Message box.
6. Set a search period. Start and end date.
7. Click "Search"
Now you see the action when a user deleted a track. You see the username. And you see the time stamp when the track was deleted.
If you want to see more data about the deleted track e.g. its start and end time, please click on "View" in the Data column.
If you want to restore any of the tracks let me know.
Under SiteAdmin -> System Tools -> Activity you can see from which IP a user was logged in. This is a new feature and has a limited history.
The _EditTrackAll privilege controls if a user can delete tracks or not. By default only users in the _Administrator Role can delete tracks