Just found out today that the DominoDefrag v3.3 Administrator database is incompatible with the latest release of the XPages Extension Library (15Jan11) because some control properties have been changed, as it states in the release notes that
"Note that the some controls have their 'partialExecute' property changed to ''partialEvents'. If you have a compilation error, just change the property name. The demo DB has been updated."
Unless you want to make the XPages changes yourself, please only use the XPages Extension Library New Year's release >>> click here
In DominoDefrag v3.4 (est release March 2011) will make compatible with newer versions of the XPages Extension Library (15 Jan11 and onward)