Doubletwist took hours to scan my iTunes library. Now it crashes whenever it attempts start up. What a waste of time and effort.
I have one particular album where it only recognized about 13 of the 18 tracks, I noticed that for some reason it didn't put a cover on the unrecognized tracks. It saw them but just didn't know they were in the same album.
I deleted the partial album out of my phone, manually and then went into my music folder and dragged the entire album out of that folder. I noticed the tracks were out of order and didn't know how I was going to fix that but Droid put everything where it should be.
So I'm not using Double Twist or recommending it any longer. Just drag and drop, it works fine.
Double Twist does do pictures well. But you can drag and drop those too.
DT doesn't do protected songs, right? Perhaps if you got the album from iTunes some of the songs were protected. I know when I tried to port over my iTunes library only about 1/5th of my songs made it because all the rest were protected.
if you want another way that is better to sync music check the link in my signature
I have a lot of good how to articles about music managing and battery life etc. PM me if interested.