Feature image not displaying on Twenty Ten theme

You have a caching plugin. Try purging its cache using its own settings then deactivating it.

I deactivated and de-installed the plugin. Still doesn’t display featured image.

Has this issue only started to happen?

This is a new installation. I just moved my domain from wordpress.c om but I was using the same theme and had no troubles as long as I sized the image correctly.

Can you link to a page on the Twenty Ten WordPress.com demo’s website that has a featured image: https://twentytendemo.wordpress.com/ (for reference)?

The demo site only shows a header. It does not show a featured image.

I’m not familiar with these themes, but sometimes WordPress.com themes can be different, slightly, to their relative www.ads-software.com theme. I will let someone more familiar take over.