After a sync the other day, I noticed doubleTwist on my tablet wouldn't play certain songs. I tried sync again, but had the same problem. In an effort to "start from scratch" I went into the Settings on my Nexus 7, selected Apps then doubleTwist, cleared cache, cleared app data, then uninstalled. I plugged my Nexus 7 into my PC and used Windows Explorer to delete everything in the Music directory, then unplugged my Nexus 7.
At this point I downloaded doubleTwist from the Play Store on my Nexus 7 and installed it again. When I launched doubleTwist on Android, I noticed it still had all my album thumbnails from the music which previously existed on the device. This seemed wrong, since I cleared cache and app data before uninstalling. I went into doubleTwist's settings and chose to rebuild the library. That cleared out all the album thumbnails because there were no music files on my device anymore.
Thinking I had an effectively fresh install of doubleTwist on Android, I started up doubleTwist on Windows to pair my device. I set the device name via doubleTwist Android, entered the IP and code in doubleTwist Windows, then tried to sync my Top Rated playlist.
This connection and sync happened at 06/27/2015 08:26:50 as seen in my doubleTwist debug trace log.
After the sync, I told doubleTwist Android to play my Top Rated playlist, and started swiping through songs on my Nexus 7. Sadly, I still have the same problem where some songs will play and some will not. What's going on? Some of the songs that no longer play are ones which previously would play! The MP3 files in my iTunes library are the exact same files, so there shouldn't be any problem with DRM on the actual files or anything. What can I do to resolve this? Using the "Send log files..." feature now.