I have a Samsung Ativ and I was a happy Windows Phone user till now. A few days ago my phone began to start creating duplicate entries. First in the Music section and later on in the Pictures section. I tried all the things I've read so far, nothing worked. I've found out that it has nothing to do with the SD-card or the Windows Phone Desktop-app files on the pc. My phone still creates duplicates (without a SD-card) when I use the internal phone storage. I think it's a bug in the OS and need to be fixed as soon as possible.
The strangest thing on this is, that not every file has a duplicate.Some of them are just shown up once. I have the problem when I'm using the app on my Windows pc and when I use Windows Explorer, that makes no difference. Now I've copied 5 files to my phone SD-card and everything seems to be good, even with the files who had duplicates. I also had other (longer) filenames from apps like 6Tag or InstaWeather Pro, maybe they are the problem??
I have the latest phone update (GDR2) already for a few months and nothing else has been changed on my phone or settings. I'm not using Xbox-Live or SkyDrive, they're switched off on my phone.