The custom color pallet was created in the Slide Master, thus all the custom slide "layouts" have the same color pallet, thus the color pallet on the slide is not editable. (I reviewed everything related, and this wasn't a resolution, thus my post requested help.) The color pallet issue is with the theme backgrounds, not objects, thanks! I created a new slide (and pulled a custom layout from the Slide Master) and then copied all of the content to the new slide, which works, but all four Modules appear to have the same issue on random slides. This resolution is a quick "work-around," and I'd still like to know what caused the issue, if you can provide any additional Articulate 360 design insights. Thanks!