Object doesn't support property or method 'SetZoom'

I am trying to add a term to a term base that is part of a translation package from my client, but I receive this error message:

An error has occurred in the script on this page.

Line: 32

Char: 13

Error: Object doesn't support property or method 'SetZoom'

Code: 0

URL: file:///C:/Program%20Files%20(x86)/Common%20Files/SDL/MultiTerm14/Editor/modern/concept.html

Has anyone seen this before or know how to fix it?

Thanks in advance,