It appears that MSDN’s new blog engine has started more aggressively marking comments for moderation. I started getting suspicious at not receiving any comments on our posts, so I checked and it turned out there was a huge queue of comments waiting to be moderated.
I’ve approved the backlogged comments now, and tried to reply to them. I’ve also tweaked our spam settings to hopefully let future comments through. Sorry if it took forever for your comment to appear!