Motorola Razr :: 10 Songs Downloaded But Only 2 Appeared In App (MotoCast)

I have a couple of problems with My Music. When connecting to my computer (iMac) over wi-fi or 3g I can access the files and stream without a problem but recently I decided to download an album to my phone and although it showed all 10 songs downloaded in the notifications bar, only 2 songs appeared in the app. I tried repeating the process, again it was downloading for a while and showed all as done, but nothing new appeared in the album. I checked the location of the files and they're there - really no idea what the problem could be. I rebooted the phone - nothing.

I noticed that some of the files are mp3 and some m4a but in both types there's more than 2 files so compatibility rather unlikely. The music app is incredibly slow, even when playing files from the phone, not over the internet. I posted a separate discussion on the phone being really slow in comparison with iOS5, but I notice it especially with My Music. Does anyone else have the same problem and is there a solution? Something in settings maybe? I'm new to Android so it's likely no answer will be to basic.