Ok quick update, Having searched the net. I have confirmed that this issue (If it can be called that) Is not restricted to the D7000. The D90 has the same problem when using a Nissin DI622 Mk 11. Its a shame that in all the positive reviews being circulated, not one including the more professional reviews fail to mention this quirk. My only concern is long term implications with regards to the flash making the cameras electronics do something it clearly shouldnt. For some reason the flashes pilot light when turning green seems to be in some way linking to the top screen led light and turning it on. I have decided to go for a Nikon SB700, and will keep the Nissin flash has an off camera slave unit. It is a good perfomance flash yes. But as a third party add on, I am not happy with the idea that sensitive camera electronics are being messed up in this way. Its an issue that people need to be aware of, and Nissin really should be sorting it. My advise for what its worth would be. Don't go for the cheaper option go for an original Nikon unit. Because in the long run if your not happy (And thats where I am) It will cost you more in wasted money, when you eventually go for the real deal.