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You need to refresh your library / playlist 
As above, please try: Main Menu > Settings > Apps > All > Walkman > Clear Data.
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when trying to transfer data to my SD card, I am now getting the following message: Transfer Interrupted. Check your SD card for possibly transferred data.
This is only a recent problem, it was working fine for months, no worries, but now it's decided to do this every time.
interestingly, it seems to have transferred some videos and photos over, but not music files. It is a 32GB Sandisk card, with plenty of space left on it (18GB).
I'm not technically minded so if anyone has any suggestions, I prefer non technical plain English if possible!! 🙂
Tried clearing walkman data - didn't work.
also tried clearing winamp data (I have this installed too), but that didn't work either.
Any more suggestions?
There couple a few reasons for this; from a faulty SD card, corrupt music data to a DRM issue with some of the music files. Have you tried simply transferring the music files only via connection with a PC?
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Download a file explorer from google play and try with it.