In DataInsight UI on Internet Explorer 9, 'Enable filer scanning' box under 'Scanner details' box sometimes dissapears.
Internet Explorer 9 is not qualified with DataInsight 2.5.1RP1.
Workaround: The issue is not seen with Firefox
Please check Hardware and Software Compatible List (HSCL) of the released DataInsight for the support of Internet Explorer 9. Please call Symantec Technical Support for further assistance.