That definitely makes me think it's an issue with the relationship between the software and the OS... The next thing I would try if possible is moving the apa to a different computer if you have access to one and trying on that, or maybe uploading it here to see if someone else can create a runtime in 8.0 with it. If that is successful, you might need to look at doing something as drastic as a full reinstall of your OS and all the software. It's a kick in the pants, but usually as a last ditch option it takes care of most problems.