I did Rotate Counter-Clockwise and Saved Losslessly.
When I reopened the image, a strip of 35 pixels from what became the top of the image were now at the bottom of the image. It didn't happen on another image I tried it with though, and it didn't happen until I clicked 'Save Losslessly'.
Is this a bug? Does it depend on image dimensions?
I'm on OSX 10.6.8
Thanks!