A Roundabout Tank in the making

Yesterday I received my eagerly awaited-for order from Knitpicks containing among other things yarn for the Roundabout Leaf Tank. I got their Shine Worsted (Cotton/Modal) in Sunflower. I really like the color and so far it's knitting up beautifully. I'm just a little worried b/c the yarn called for, Berroco Denim Silk, is a ribbon yarn and the one I got is just normal yarn. Have people here had problems substituting a regular yarn for the ribbon yarn in this tank?