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Which phone do you have and which album version do you have?
Where are you saving your pictures? (Internal storage or SD card)
Boot on safe mode and check again
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
If that doesn't work then you might want to consider repairing your phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
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