_mcePaste hidden divs appearing in final content

I saw that some other people had this trouble towards the end of last year, but did not see any resolution.

One of our users has been experiencing the problem setting up emails. Here's the web version. If you view source you see that the whole text is repeated in _mcePaste divs.

This is the web version of an email, but the emails contain the code as well:

http://action.sierraclub.org/site/MessageViewer?em_id=188987.0

<div id="_mcePaste" style="position: absolute; left: -10000px; top: 0px; width: 1px; height: 1px; overflow-x: hidden; overflow-y: hidden;">FOR IMMEDIATE RELEASE</div>

This isn't a problem viewing on the web, but when the text is copied from the page, or forwarded by email, the text then appears duplicated, and or badly formatted.

Working on repeating it, but is this still an ongoing problem or new?

Thanks,

Adrian