I can't post a link to my portfolio lo's I've tried off and on for a few days and all I get is an error saying something like "We are unable to send your message. Please try again later."
I haven't had that particular issue... but I've had many issues where the scroll bar doesn't stroll down - I have to actually click on the item and repin from there... maybe try doing the same with the comments?
Are you logged in to your Pinterest account? When I try to view anyone's layout I get the 404 error, but after I log in then I am able to view others links here at SSD. Don't know if that would help you or not.