The plugin works. The reason it is not working for you is mostly likely because your theme does not use the WordPress header system.
Are you using an downloadable theme? If so, please post a link to it here so that I can take a look and confirm that it does not support the WordPress header image system.
Yes, it is a downloadable theme and I suspected that might be the reason after I posted. I tried it on twenty eleven, twenty fifteen and twenty fourteen and it worked so it is obviously my theme.
The best I can suggest then, is to modify the theme to support the WordPress header system, or to ask the theme developer to add support for it.
Hi!
I have the same problem.
I’m using this theme:
http://demo.planetshine.net/goliath-wp/
I’ve not much coding experience ;(
I can’t tell from here. I’d need to see the code to be able to assist you. Perhaps post a link to a downloadable zip file of the theme.