I have a wordpress website with a custom theme. Now when I upgrade that wordpress install to 3.3.1 it looks like the javascript is nog working correctly. All pop-ups (like adding image) and functions (like collapsing boxes or opening screen options) don’t work. Also the admin bar doesn’t show anymore
What could the problem be? It worked fine in older wordpress website’s (3.2 and less)
Well, after a few months I finally found my answer (I stopped looking for a while). Turns out I had this error:
Call to undefined method Custom_Admin_Bar::add_group()
The theme contains a Custom_Admin_Bar (in classes.php) and that was causing the error because it didn’t had the method add_group().
I removed the Custom_Admin_Bar and then it worked perfectly.
http://wordpress.org/support/topic/call-to-undefined-method-custom_admin_baradd_group