Tom, the genetics for fragrance are not lost due to cloning. That's just one of those rose myths that never die. Fragrance is a recessive gene and cloning the rose does not change the genetic make up of the rose.
There are a lot of variables that do impact how we experience fragrance in a rose. Some roses only release fragrance early in the morning. Others will only release fragrance in humid conditions. Others will release fragrance only when ambient temperatures reach a certain degree. Those are just some of the variables ...
Then some of us have more sensitive noses than others and can detect fragrance quite easily. The rest of us can't smell a thing ...