Can I ask what you did to change the aspect ratio? Did you have to re-render each screen?
No. Luckily for me I had rendered all (well, 99%) of the scenes at 1600x1200. The original version of the game was 1024x768. So, I reduced the original renders to 1280x960, and then cut off the top and bottom to make it 1280x720. But, also luckily for me, the original game was presented in a letterbox format, and so the original viewport was actually 1024x640, so I didn't lose much off the top and bottom by cutting them off. I hope all that makes sense. :P :)