Ok, we need to find where the thumbnail HTML is created in your theme or plugin. Is the section that you’re trying to modify part of the theme or a plugin? If it’s a theme, is it one I can download and inspect the code? Typically you would look through the code to find the specific post-thumbnail that you need to modify and then we could go from there.
Are you using a CDN? Or a caching plugin?
Sorry, I’m not sure what you mean. I’m trying to edit one thumbnail on my site, and having changed all possible sizes even though I know the precise ones I’m trying to change are definitely there, yet it’s still not showing up. I haven’t modified any theme or plugin.
What I did notice is that when using PTE, for example I’m trying to change the thumbnail listed as “related-img”. The image class is listed as “attachment-related-img wp-post-image”. However the source is the original image with “?resize=180%2C138” at the end. I’ve not much idea about coding beyond the basics, but I don’t know if that helps. Probably not!
Thanks for the swift reply, by the way.
what’s your theme name? It seems strange that it’s adding the resize part on the image. It should have a completely different url if it’s using post thumbnails.
It’s Avada by ThemeFusion.
Sorry, just solved this – it was the Photon function in Jetpack that was causing the issues. Thanks for helping anyway!
Oh, great, is it a configuration issue that would help anyone else? Or did you just disable it?
I’ll try to enable photon and see what I can find out.
I just switched it off and it worked straight away. I haven’t noticed any real difference in load times after switching it off, so I’m happy just to leave it. Thanks again for the help and the plugin itself 🙂