Configuration / Customization settings missing

I’m using WordPress v 4.5, and Scroll Trigger Boxes 2.2.2.

I used to be able to customize my scroll trigger boxes, but after some updates (I cannot pinpoint when this started), the stb don’t show up anymore. The configuration/customization settings do not appear on the Box pages.

I have tried deactivating all plugins, defaulting to the 2015 theme, reinstalling the plugin, but no luck. May have to use another plugin unless there is a solution? Thanks.

https://www.ads-software.com/plugins/scroll-triggered-boxes/