What happened to the old icon?
Thanks for bringing that to our attention. We will look into it.
And what's the difference between a Discussion and a Question when posting a new thread?
"Discussion" is the default standard thread type that you are used to. Where as "Question" is a new thread type which adds functions that are conducive to questions. It allows readers to vote on which response is the best answer, and then for an answer to be marked as the "Solution".