Hello, I hope english is better to understand for you:
I had a BV 10-40 for about 6 month, but my one had enormous clouding problems (as you can see in the discussion, I linked in my post before. Page 4, there are some photos).
The update didn't really help. The only difference was, that the picture it self was a little bit less brighter then before. And of course the clouds too....
I returned the 40" and got a 46" wich has no problems at all. My dealer told me ones before that ther will be a hardware kit coming out later this year wich should solve the clouding problem, because the problem is thermal related. I suppose that's why that kit is called "cooling kit".
A friedn of mine (@ räuber, I hope we are^^) who lives in germany asked his dealer some weeks ago about the kit, but he didn't know anything about it then.
So far I hope I could have helped you.
Georg(e)