Okay, I figured it out finally, after about 30 minutes.
I was wrong in that the Bill of Material settings on the property tab was not identical between the old and the new drawing. Under the Configurations section, there were no configurations selected. I always thought if there was only one config that it would automatically select it. It worked that way in the new drawing when I inserted the BOM anyway. Why it didn't in the old drawing, I don't know.
So yes, it was something simple that I over looked.... I feel kinda dumb now... :-)