No, HWI is up and running perfectly well. I have been logged in almost continuously for the past two hours with no difficulty. Other members were posting at fairly regular intervals up to the time of your enquiry here so it doesn't appear to have been offline at all.
The HWI Forum is currently unavailable. ProBoards Support state that a number of issues during the day have been resolved but there are still over 30 servers which are currently offline. I have no indication as to how long it might be until normal service is resumed.
I don't think that is the reason why we have been quiet as the forum has been available throughout the day. I believe it was only offline for a very short time - probably no more than an hour. As you say, normal service has been resumed.