Working with a fresh install of 3.4.1, I've installed a new theme – Imbalance 2 – via FTP, and now get an error when clicking 'Live Preview' or 'Customize' links.
These links worked with the default 'Twenty Eleven' before the new theme install, but now the same error crops up whichever theme I install. Here's the error:
Fatal error: Call to a member function theme() on a non-object in /home/user/wordpress/wp-admin/customize.php on line 60
This is driving me mad as I'm now unable to customize themes and can find nothing relating to this problem in other posts.
Any help would be greatly appreciated.