So, here's their answer, verbatim:
I'm not sure about when we will be adding support for pinning directly in Hoop.la. Hopefully soon, but it's not being worked on at the moment.
Regarding the main issue you brought up here, just keep in mind that we have no control over how Pinterest gathers images from web pages. We have not made any changes on our end certainly to block Pinterest.
We will definitely investigate to see what the issue might be, but just keep in mind that this is a Pinterest issue and not our issue. When I Google the issue, I see lots of sites reporting that Pinterest periodically fails to "pin" from supplied web pages . . . and we will try to find out exactly what they are doing to scrape images from web pages to see if there is anything we CAN do.
SO, in a nutshell. this is my interpretation:
1. They are working on an internal "Pin" button that will appear at the bottom of clips, so you can pin directly from that rather than from the "Pin It" button in your tool bar. But they are giving me no delivery time.
2. They say that the fact that the "Pin It" button no longer works is a function of something that Pinterest changed rather than something they changed. They are looking into why this might be, but are vague about whether they will or can fix it.
So, I think we need to be patient to see what fixes/new pinning features they will provide. Unless I pay large sums to expedite new features, I have to wait until they decide to roll out the feature to all of their sites. I'm so sorry I could not have a more satisfying resolution for you at this time.
The inability to consistently and easily pin from this site is a hardship for me too 
, because I promote all of the site's blog posts on Pinterest as well as Facebook. So I often have to download and upload images manually to Pinterest now in order to pin.
At any rate, this item is on my personal list of things that I've asked them to fix, and I'll update you when there is one. Just can't tell you when, unfortunately.