Pinterest Pinboard worked and then stopped

Hi!
I installed plugin a week ago, all this week worked like a charm. Today does not show any pins. I know my version of WP is the one “not tested with”, but however, it worked fine, now the error message that it can’t retrieve any pins is all I see. I decativated, deleted, re-installed. Same error message. Has anybody else had this problem?
thank you
Anna

http://wordpress.org/extend/plugins/pinterest-pinboard-widget/