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Wordpress doesn't generate thumbnails in my server. I don't know why. Old images' thumbnails get regenerated; however, the newly uploaded ones doesn't. I used Regenerate Thumbnails plugin to regenerate all the thumbnails. The new ones doesn't regenerate. It gives me error "The error message was: Unknown failure reason."

I have checked everything. I have GD enabled in php.ini and the directory is writable. What else should I check?

  • What happens if you disable all plugins, activate a default WP theme. Then upload an image? – Sisir Jun 20 '15 at 8:35
  • I'll check it now – Gasim Jun 20 '15 at 8:44
  • didn't work. I am going to check the PHP logs – Gasim Jun 20 '15 at 8:47
  • May be something is up with server and php settings. Check error logs. – Sisir Jun 20 '15 at 9:05
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I found the problem. For some reason it was a JPEG file's issue. I recreated all the JPEGs and now it generates the thumbnails...

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