0 bytes _original image

Its a funny thing. When I upload a photo on my website it doesnt generate a original sized one, and makes it a 0byte sized image with the filename. Meaning i cant view the original size of the image. I've tried creating a 3rd image size setting _original as well but no results... Just same error again.

Is there any way to fix that? Im using the very latest drupal build at the moment.