WordPress released its 4.5 version called Coleman on April 12.
Along with the interesting features like the responsive view toggle in the customizer, came a few problems that effected some of our themes.
Indie Pro was the worse effected by the upgrade with a complete failure of the customizer options. After a bit of investigation it turned out to be a naming conflict. Any customizer option that had a “widget_” prefix for a name broke the customizer. We swapped these out for a different name and everything started working again.
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We’ve rolled out updates to both Indie Pro and Eryn Pro that will fix these issues. Our free versions listed on WordPress.org have also had updates submitted.
We will go through the rest of our themes checking for this issues over the next couple of days.