Yes I have seen this before, I read a post a long time ago where a member had the
same issue as yours. It turned out to be an issue with the computer he was using,
maybe a virus who knows and he was also using an 8gb card of another brand. He
bought a 16 or 32 gb card formatted it in a different computer and downloaded all
updates from that other computer and everything turned out fine. I don't know if this is
going to do it for you but its worth the try. good luck.