Great to hear from you. Please, can you send a link to your site so we can take a look? If you want to keep your site private, you can use the Set as private reply checkbox below the comment field.
Thanks for sending your site’s URL via email. I thought I’d answer here because this can be a common challenge. Please, try installing the following plugin:
The easiest way is to go Plugins > Add New and search for Regenerate Thumbnails. Once activated, go to Tools > Regen. Thumbails and click Regenerate All Thumbnails. Let me know how that goes 🙂