temp_user_here
Actually there is a chance that all images disappearing could be due to user error. It could also be both, but at least you should watch out for this user error, that I almost did:
I went to gallery app. I see albums in grid view (at least I do). The first album is "Camera". I wanted to delete the latest picture I took. In stead of first clicking the "Camera" album, and then inside the album holding down on the latest pic and deleting it, I just held down the "Camera" album, and almost deleted the whole album. Glad I caught my finger before doing it.