EndNote desktop 2010 bug
It is possible some of you may have moved from EndNote Web to using the desktop version of EndNote (now in version x3), or indeed be using both the Web and desktop versions of the software, and moving your references between them. Should you be using the desktop version, IT Services report cases of older versions of EndNote (X2 to 8) encountering problems importing year data for items published in 2010 or later. When this occurs, the year may be added manually - see http://www.endnote.com/support/Faqs/Import/faq20.asp for further details.
Note that it is only the year data that fails - all other reference data is imported correctly. The good news is that these issues do not impact on EndNote Web (hurray!) or indeed the latest available version of EndNote desktop.