Recently, I discovered a problem with the "Pin it" button for Pinterest in Internet Explorer (v9 at least). It seems that this button is causing issues with the 'back' functionality in the browser. When right-clicking on it, an entry like '' appears as the previous page.
It appears that Pinterest is utilizing an iFrame which Internet Explorer then adds to the history. Unfortunately, clicking 'back' does not have any effect. Is there a known solution to this issue?