MediaLab v2012 does in fact use IE7. If you uninstall IE9 and revert to IE7 on these machines, you could likely turn off the javascript error reporting. That should do it.

You can do this from here:

Control Panel\Programs and Features\Turn Windows Features on or off\Internet Explorer 9 (and/or 8, etc)

If that's not an option, let me know and I might be able to modify the program to suppress those messages.