post a pic up sounds like it either:
1) under show you dont have your polygons clicked on
2) when you convert back to polys from sub-ds make sure your setting is vertices in the option box Modifiy> convert> Sub-d to poly> option box.
Once i see a pic i'll be able to see what going on a bit better..
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb