Clicking on button Upload on an image field shows this error message:
An error occurred while attempting to process /file/ajax/field_image/und/0/form-_UK2ipoZYiucuPLUCSEgpUCTHgGA4tI_odCk1FRGKfM: Cannot read property 'field' of undefined
Not sure if this is an ajax or an image field problem so or it's the result of a conflict with a third party module.