Resume Playback when turning on doesn't work

[Mr Wolf]

Hi all!
I've installed RockBox 3.15 on my SanDisk Sansa Clip Zip. The Resume Playback setting doesn't work, i.e., when I turn on the player and click on the back button or on the corresponding setting on the menu, it starts from the beginning of the first track of the first playlist (I have all my playlists in the root directory).

Can anyone tell me if it's a bug?

Thanks in advance.