Discovered another bug in FPD, fairly easy fix if the developer reads this.
Layers cannot be re-arranged on the latest version.
The plugin has a checkbox value 'zChangeable' that allows you to re-arrange the layers, but this option is only visible to the product builder. It should be available for all uploaded images, text, designs.
Lines 7976-7967 in the JS. FancyProductDesign.js
From: reorderHtml = element.zChangeable ? '<span class="fpd-icon-reorder"></span>' : '';
To: reorderHtml = '<span class="fpd-icon-reorder"></span>';
Just make sure you have debug turned off to fix the problem. :)
You can set this in the Settings > Default Element Options.
z-changeable is there, but the one underneath images doesn't affect the product designer. The z-changeable option for text works great though!