Customize.php results in blank page on Sydney theme

Hi,
Just installed a clean 4.3 Wordpress and Sydney theme, as yet there are no plugins installed at all.
When I click any of the admin options that use customize.php the screen is blank.
I’ve tried installing the plugins recommended with the theme but these don’t make a difference.
Any ideas?
Thanks in advance.
Steve

Fixed this - increased the PHP memory_limit from 32M to 128M

Thanks for letting us know the solution.