[xwiki-users] Images dissapear from pages after page modification.

Hi, I just updated to xwiki enterprise 2.3.1.29118. Now I am experiencing a problem when I modify a document that contains images. It happens that when I modify a document (not all the time) and then I save the document, some images are shown as broken images on the page. But if I follow the link on the html source of the page the image is still there. The pages where that happens have the special character -. I am using a mysql database configured with charset UTF8. If I delete the attachment of the image and upload and image with the same file name it still doesn't work. Regards, Abel