There is a lot written about this kind of issues. but all do not seem to be the same as what we are experiencing.
We have a big portion of products (so not all) that has product images not shown in the category list.phtml but are shown at the view.phtml (product detail page).
This is what we tried already
- Changed from normal to flat catalogue
- Check to be sure the correct storeview has a default image selected
- Chmod -R 777 Media/Catalog
- Removed image cache to let it regenerate
- Changed the code in the backend from small_image to image
- Removed ->resize(135) to show original image
- Checked error and access log for error or notices related to this
- Removed .htaccess from media folder
Nothing seem to help what to try next?