I'm sorry that you're experiencing problems with playlists.
What device are you using? What version of Android?
Are you syncing to internal storage or the SD card?
To verify, the .m3u playlists are present in the Music folder and they are visible and usable in Google Play Music? But they do not appear in our app even after a library reset?https://www.doubletwist.com/help/question/how-to-restore-missing-playlists/https://www.doubletwist.com/help/question/how-to-restore-missing-playlists-on-android-44-and-sd-cards/
If this is the case, please try one more reset and then send us logs files from your device.
1. Verify log files aren't appearing even though the .m3u playlist files are present and the library database was reset.
2. Go into doubleTwist Settings.
3. Scroll down to select "Send Log Files" and tap "Continue".
4. Enter "DT Issue 20150417b" in the description text and tap "Send Logs" to email the logs to us.