Something altered my picture files's proprieties

Some yes, some were made with Photoshop apparently.

This for example had its comments changed to
CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90
And obviously its not a photo.

https://lh5.googleusercontent.com/SBW-W_0HMkMMSzL_ggeijzapN1DOV2_vGO5MIKt0ecgH=w1600-h1200-no

Could someone make a quick check? download the image and check what’s in its comments.

I just tested it and had no problem changing the comment, and it didn’t reverse.
Download and install IrfanView.
Make sure the file associations are set to edit with IrfanView.
Open the image, change the comment, close the image.
Open it again and see if the comment is still as you have set it.

Well the problem its not if I can change my file’s comment, I had already tested it on an image a couple of days ago and its still there with my comment not changed.
The problem is changing over 2000(and its an optimistic estimate) file’s proprieties back to their original comment (which in most case isn’t possible since the original info its gone, gone forever), but what makes me really wonder if what’s changing or altering the view of my file’s proprieties, since as I said I have recovered some image libraries from over 2 years ago’s backup and some of their comments was altered.

My guess it is a setting in Picassa.

Yeah my thoughts too
I’ve already had a look into Picasa’s forums, guess I’ll have a further look.