I have had this happen with two Samsung Galaxy Legends. This time I opened an attachment on an email from a trusted source and instead of going into the attachments folder it started a new folder in my photo gallery named downloads. I think this is what is locking the photo gallery and cannot view individual pics, delete pics or folders. The folders all show up but they are frozen. Any advice would be greatly appreciated as I have a video in there I need to send to my vet.