I cant upload any image to K2 items. If I attach it using Image tab, or if I insert it in the content area of the item, always is showed an error 500. Tried to chmod the directories and nothing. ¿Any solution? I have read about it but nobody gives a solution.

Any solution??? I can upload images to Categories without problems, but not to Items.

For more information..it not happens with all images. For example, image 1 attached can be uploaded fine...image 2 cant be uploaded (although it has 2 kb)