Loading swf's 3 deep

Ok…here it goes…

I have a main swf(a) file. I load an swf(b) into a MovieClip with a transition–within that swf(b) I want to load another swf© into a blank MC using transition effects. When I publish(b) by itself and click the buttons swf© loads fine.
When I load (b) into (a)–(b) will no longer load ©.

I know this prob doesn’t make sense…which is why I can not figure it out, but you all are real smart out here…so any help would be appreciated.