Insert/Edit Link not working

Hi All,

Was working on a site today and everything was fine. I then realised that WordPress needed updating so I did that. Since the update the Insert/Edit Link and the Visual/HTML tabs had stopped working.

After a long search on the forums I installed the Use Google Libraries. That fixed the Visual/HTML tabs but the Insert/Edit button still does nothing in both the Visual and HTML views.

I’ve turned off all plugins but it’s still the same. I reverted to the TwentyTwelve theme and it works in that so suggests the problem is with the theme I’m using but it was working fine till the update. Is there a new file that I need to reference in head.php to get those buttons working?