Why wordpress doesn't generate thumbnails?

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?

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?

• post-thumbnails
• thumbnails

Share Improve this question asked Jun 20, 2015 at 8:26 GasimGasim 36711 gold badge33 silver badges99 bronze badges 4

• What happens if you disable all plugins, activate a default WP theme. Then upload an image? – Sisir Commented Jun 20, 2015 at 8:35
• I'll check it now – Gasim Commented Jun 20, 2015 at 8:44
• didn't work. I am going to check the PHP logs – Gasim Commented Jun 20, 2015 at 8:47
• May be something is up with server and php settings. Check error logs. – Sisir Commented Jun 20, 2015 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...