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about the duplicating photos with varying resolutions and Sizes problem... I have a band-aid fix to this without deleting everything in your phone. What you do is to find time to actually MANUALLY DELETE the extra photos. Don't delete it by Taping on the Album app and deleting everything on the home photos.
Instead tap the album then on the UPPER LEFT CORNER (If you've updated the albums) tap the 3 bars beside the album icon to access the album menu, then tap the FOLDERS choice.
You should see alot of folders with Thumbnails named with numbers and different resolutions. Delete all the folders labeled as Thumbnails or cache. *note that you cannot delete whole folders but the folder gets deleted automatically after all the contents inside it is deleted
Afterwards, go to your phone's settings->App-> Album
Then tap the Clear Data button
After that restart your phone.
This actually "fixes" the problem for a while but usually after a few restarts or Phone charge the folders comeback and you have to redo the whole process again. But the folders that are made becomes fewer than the 1st occurrence of this problem and deleting the photos shouldn't take as long as the 1st.
Honestly i think this is definitely an Application bug and should be fixed by Sony, since you know its their built in app for Multimedia
I had the same problem. I fixed it by uninstalling the updates of the ALBUM and WALKMAN apps. The problem has never returned since.
yea that also helps since it's a bug caused by the new update. I'm just waiting for Sony to fix the bug, i don't really mind deleting the thumbnails 
To fix the issue permanently, follow the steps as described here: /t5/Album/Duplicate-images-in-Album-application/m-p/748709#M344
Thanks .. that worked for me :smileysmileythumbsup: