I now know why this thread is lost. It was created under the username 'silylene' (I am pretty sure on this).
In fact, I did a seacrh, and all the threads created by silylene are gone, as far as I can tell. And all the posts of silylene are gone. WTF! (I am allowed to voices some frustration I hope)
Please, give my back all my old threads, posts and my username.
thank you DH.