In reply to Robert Durran:
I noticed your photo dropped to 4 yesterday even though it had no new votes . I think your right it was some sort of glitch in the system.
As for the malicious down voting I suspect it's been going on for years, but now that so few people vote on photos anymore that 1 malicious vote can have a dramatic effect on your photos position . This problem is causing photo of the week becoming irrelevant which ruins it for everybody.
I also suspect that some people have stopped posting at all because of this which is even worse.
There has always got to be one ----