Missing thumbnails

Seems to me you use a WordPress theme which uses some kind of php library to resize images. You should really use WordPress default add_image_size() and wp_get_attachment_image but if you were the one who created the theme you would already know that.

There are 3 things you can do:

  • find a new theme that is not that outdated
  • dive into mytheme/thumb.php and find out whats going on and where it fails
  • update the theme wherever it uses thumbnails and/or different image sizes with the above default WP functions

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