I updated to WP 4.5 and customization no longer works. The customization page would not even load (blank white screen). I disabled all plugins and I could get the customization dashboard to appear, but the only option is to change the theme, non of the other functionality is there. I have checked and am running php5.4(native) and all other plugins are up to date. I am running a child theme of pure & simple – the parent theme is version 1.3.1. If I install the 1.5 parent theme will I lost the customization that I added through customizer – or is that contained within the child theme?