I have a full color illustration I am trying to export as a PNG for a client. I have a diamond shaped logo comprised of a large white diamond with a smaller black inside it. The whole file exports fine excepth the logo turns completely black. I even tried a test file comprised of a simple white rectangle on top of a color background. Inside that rectangle I added a smaller black rectangle. When exported as a PNG, I ended up with a completely black rectagle on a color background. It also happens when I save for web. What can I do to resolve the problem. Thanks.