Oh man... theres gotta be a better way to list those. I had other people try to find this feature on OSX and it we just could not find it. Looks like you have to click on the actual file tab. UX wise, clicking on a tab in ORM designer switches between content ( as most tabbed interfaces do ), and that file tab does not look like an actionable item at all.
The PNG feature is not super important, as we can use the PDF just as well, but our system originally was built with a PNG since we had a map tiling feature that let us split up the image so we can zoom in and out within a web app. So some sort of image output would be nice at some point. But getting it to a client in PDF is more important for now.
I have attached an image for this looking for where to do export as PDF. The one in this thread was still not clear enough for me any my friend to find what to click on to make it happen.
If possible, can you move the items in this File menu do the main navigation bar? There is plenty of screen real estate. Having them where they are I guarantee most people wont look for them.