When I started changing over to Async ads my editor started adding extra code automatically when saved pressed /../../../../.. replacing the // What is causing this? Any help would be appreciated. Now Editor changing both code types which is causing ads not to show.
Well they changed the code and possibly Expression doesn't understand it. The first thing you might want to do is go look at the IntelliSense and make sure nothing's turned on there that could be messing with the code.
Ultimately, I think you're going to have to get another editor, or place it in some other way. Or else go back to the non async AdSense. Expression is a sunset product now; there aren't going to be any more updates or any support. So it may be best to find something else.
Before I switched over to WordPress, I used PHP includes to place the AdSense code. Are you familiar at all with PHP?