Please forgive my lack of familiarity with the templates associated with this mod. I was way off in my assumptions.
I had the same problem as a1deano, the shipping address was not populating if left blank.
At Jon's suggestion, I reloaded cart.php from the download version and modified the code again according to his instructions included with this mod. Now the shipping address is automatically populating as it should.
a1deano, I don't know if this will work for you, but it worked for me.
Thank you again Jon, for your lightening fast response!