Splash and Background Images Won't Update

I've been trying to update our channel with a new splash image and background image. I'm able to upload the new images, and they show up fine in Direct Publisher's preview, but I can't get them to update on our Roku device.

I have tried twice now. Both times I also made other changes to our categories or layout at the same time that I updated the images. Both times the category and layout changes showed up on the Roku totally fine, but the new images will not show up. I have done several system updates on the Roku, I've restarted the device, and I even removed the channel and re-added it.

I also noticed that the channel version number isn't changing on the Roku. In Direct Publisher the version number started out at 7, and is now at version 11. On our Roku, it still says version 7, even though some of the category and layout changes are there.

I thought maybe the changes just weren't approved yet, but Direct Publisher says that my channel version 11 is published, and I received emails, stating that my changes have been published.

Anyone else having issues like this? Any ideas about how to get the images to update?