Images all showing in full size

Hi,

I’ve just switched with the High End theme and I’m confronted to a problem: the theme doesn’t display the images as I’ve sized them, but as their original size when uploaded in my media library.

How can I fix that so it would take into account the resize, and so I would avoid going back through 800 articles 🙂

I’ve seen a similar thread, and it seems there is a code that can fix this, unfortunately half of it is private, hence my request!

Thank you very much for your help!

Nathalie