A .capx file is what happens when you save your project as a single file from the file menu.
On the scirra forums, this is an easy plug and play save file with which we can more thoroughly diagnose problems with your code, and help figure out what is wrong. It's often the case that the problem isn't where you'd expect it to be, so it's helpful to be able to look at the whole project and diagnose the code from there.
I recommend Google Drive to upload your capx, and then post the link here so we can download and diagnose.
Hope that helps!