I've had a lot of things go wrong in the time I've been in SL - most of them my own fault. But this was a first for me.
I was puttering away and noticed the handrails on this bridge looked funny - suddenly they were transparent. Except the textures weren't set to transparent (I looked). So I tried to reload the texture and it wasn't there. It was listed in my inventory but it was blank!
I'm running around to the various places on the various islands where I used it and replacing them. I thought about uploading it again and decided that a retreat on this one would be a good idea.
SL is just one big adventure. :)