I have a MBP running OS X 10.6.8. Whenever my friend sends me a jpg created in Photoshop on a PC system I cannot open it. I have to email it to a PC here, open it in Photoshop and save it under a new name. Then when I email it back to my MBP I can open it. Funny thing is that my partner gets the same email on her Macbook and can open the jpg first time, no problem. We both use gmail.

Also, I don't have this problem with jpgs from any other sender, just this one exception. Any ideas?