I’m trying to just run the base Hello World extension on the Native Rig, however I don’t see a button to change colors like mentioned in the docs here: Extensions | Twitch Developers
According to the Developer Rig console (the bottom section), the extension is running properly. The main display, however, does look suspect. What are the position and aspect ratio of your component?
Change AspectWidth to 30, AspectHeight to 40, check the apply CSS Zoom checkbox, and click Save Changes. That will restore the defaults. Then, in the Developer Rig, click Refresh Manifest in Project Actions in the Project Details view.