I just installed the plugin and was really excited at how it is looking on my blog: http://www.supermommoments.com/
Unfortunately though I've tried pinning several images using the plugin. It opens the pop-up window and looks like it's going to pin normally, but when I submit it returns an error that says "Sorry! Image not found. Close the window and try again."
One other thing I noticed is that in the pin pop-up window the thumbnail that typically shows in the square there is displaying an empty box.
Not sure what is wrong and the same thing happened when I pin from Home Page or Post Details page.
I deleted the plugin and reinstalled. With default settings it does work so I went through and changed settings one by one, checking to see if the plugin would work after each change. I've isolated the problem to the "Description Source." The default is "Page title." When I set it to my preferred option of "Picture title or (if title not available) alt attribute" then I get the error on the pin pop-up page. The error is nicely formatted and looks like it may be returned by Pinterest?
As I was fiddling around with things I started getting a different error message in the pop-up, this time it didn't display anything that looked like the normal pinning pop-up and instead it just had the text "NoSuchBucketThe specified bucket does not existpinterest.comD6E9BDEE06831360UjZrdOtP31jSjvODzu+Ub6/tvKNiiPqCI8TtJq/NJni//MRbp2AJ9Wf6fbKyCNur"
I currently have it set back to the default for the "Description Source" so the plugin will function, but let me know if you need me to break it again for you to see?