Javascript error prevent showing of buttons for sharing/editing resources. Exhibiting issue with 2012091200 (2.3, release candidate 1). Error details from IE:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C; .NET4.0E; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Timestamp: Tue, 12 Mar 2013 10:34:21 UTC

Message: Object doesn't support this property or method
Line: 35
Char: 36
Code: 0
URI: http://able.askham-bryan.ac.uk/lib/javascript.php/1360580492/blocks/sharing_cart/block_sharing_cart.js