When using MultiTerm 2007(on Windows 8.1), I can't add (input) any new word because a "script error" message appears immediately after I click the "add in Entry'.

It says as follows (original message is written in Japanese):

  (note) Until last evening (Oct. 30), I have used this MultiTerm 2007 (on Windows 8.1) without any problem.

          I tried, "rebooting", "uninstall and then reinstall of MultiTerm 2007" , "restore of system" , but no avail.

         When opening  the MultiTerm 2007 "as the Manager", I could add (input)  new words without any problem; however, no cooperation with Trados 2007 is feasible.           

   Script Error

                [   !  ] Error has occurred in the script in this script.

line: 57

character: 2

error: Undefined or null-reference property 'is Active' cannot be obtained.

code: 0

URL: file:///C:/Program%20Files%20(x86)/SDL%20International/MultiTerm%202007/Editor/script/main.js

            continue the script in this page?

                     YES/NO

Please help me.