Feature Image won't resize

Try wrapping it with the if statement:

if ( function_exists( 'add_theme_support' ) ) {
	add_theme_support( 'post-thumbnails' );
        set_post_thumbnail_size( 150, 150 );
}

That didn’t work either… ?? It’s supposed to make it automatically resize isn’t it? I can have normal images resize but just not feature images..

Are you testing with a new image each time? Or are you going back to see if your previous ones are resizing?

If it’s the latter, then you probably need to go back and rebuild all post thumbnails.
https://www.ads-software.com/extend/plugins/ajax-thumbnail-rebuild/

No I’m using completely new images each time….

What theme are you using?

I’ve edited the twentyten theme

Is there not already a code in the functions.php file for thumbnails? Perhaps this is being called also and is overwriting the original?

Do a search for post-thumbnails and see what you find.

The only post-thumbnails is the code I’ve added in there which I showed earlier… It’s so frustrating ?? Thank you for your help so far

No worries. I have to run out for about an hour. I’ll be back on afterwards. I’ll check back here when I get home.