EXIF orientation tag not updated after rotation

First of all: cudos for the great program.
I found that the EXIF orientation tag does not get changed after I have rotated an image in cam2pc (I use a Canon Powershot G3), although the EXIF image width and image height fields do get changed. This may lead to problems in other programs (such as the Photoshop file browser, which automatically displays images according to their EXIF orientation tag, i.e. images that were previously rotated left in cam2pc to make them upright are rotated left again resulting in an image that lies on its left side). What is the best way to update EXIF orientation tags so that they correspond to the actual orientation of the picture?
I found that the EXIF orientation tag does not get changed after I have rotated an image in cam2pc (I use a Canon Powershot G3), although the EXIF image width and image height fields do get changed. This may lead to problems in other programs (such as the Photoshop file browser, which automatically displays images according to their EXIF orientation tag, i.e. images that were previously rotated left in cam2pc to make them upright are rotated left again resulting in an image that lies on its left side). What is the best way to update EXIF orientation tags so that they correspond to the actual orientation of the picture?