Thanks, Matt.
Sure it explains the issue...
But now... How could I zero-out that EXIF tag?
the zero out in the tag mc does for you, but you have to rotate those images first.
i made a view (a smartlist will do also) with the rules:
media type is image
Rotation is not 0
this gives me the images with a rotation value in the tags. although they show up great in mc, I'll rotate them, the value will be set to 0 and with some luck the rotation is right in one try, otherwise a few more rotations can do it. one thing to make it easy is adding the rotate left and rotate right to the toolbar, and make the images big enough, you can do it all in the view scheme (smartlist), and select a few at the same time to rotate.
hope this helps
gab
edit:
here are two images of my lib. in the first you see the pics that need rotation. under the pics are the rotation values as in the exif tags, this gives an idea about the rotation it needs. they are on 270, rotate right sets them right in one click (see the toolbar).
pic two is the result, the rotation value is gone. the pics are rightly rotated, and after a refresh, they are gone from the list.
http://pix01.com/iT@gXxg