Javascript error with select users button

When attempting to remove/add users via the select users button, the button is non-functional and I receive this error:

Message: Object doesn't support this property or method
Line: 209
Char: 2
Code: 0
URI: http://server_name/js/report.js

Recently upgraded to version 4.6.0 of ADAudit Plus app. My PC is XP/IE 8