A couple of weeks ago, user reported that tracks downloaded for offline use and stored on the microSD card disappeared without notice whenever the device rebooted or the card was removed. Despite most of us are commonly use microSD cards to store offline musics, the issue has left quite a few users confused.
Fortunately, Google has given the issue the priority treatment it required, and the version now available in the Play Store is free of this bug. According to the changelog, version 6.0.1950S also fixes an issue that prevented some songs and albums from showing up in the My Library section.
By reading the comments on this Reddit thread, it seems that the update also fixed a problem with the way album art was displayed in the notification dropdown.
It appears that the update is causing the app to re-download any music you have marked for offline playback, presumably to account for the possibility that some songs were removed by the bug in the previous version.
Have you noticed this issue? What other bugs in Play Music would you love to see fixed?