Good Morning,
I have been in contact with Underused, and he explained that he wanted to remove his content from the forum. That's all I know.
To everyone: you own the material you post to the forum. However, it is bad forum manners to remove the content of your original post after it has turned into a discussion and several people have spent time thinking about the subject and composing their own material in response. To make matters worse, the original poster in this case also deleted most of the subject, making what's left of the discussion nearly illegible.
So, yes, you own your material, but you also have a responsibility to the community when you engage publicly, especially when you start a discussion. I have written to Underused and told him the same thing.
To date, this is the ony occasion when this has happened, but I thought it appropriate to discuss it here, given the context.
Thanks,
Matthew