All I did was copy the picture and then open it with an editor and save it again... (without any extra scripting)...
So, that is really strange. If you are using Internet Explorer, I'd suggest trying to hit the Compatibility View Button on the address bar and then try to edit the page again, then turn it back off when you are done.
Or as a final trouble shooting effort, set me up as a coauthor temporarily and I'll give it a look firsthand...