Hi Colette...
Depending upon your geometry, drafts can sometimes be tricky. Sure enough, in this case your geometry is causing the problem. Per the PTC Help Guide on drafts: You can draft only the surfaces that are formed by tabulated cylinders or planes. What this is saying (albeit cryptically) is that spline surfaces or complex curvatures may cause problems requiring alternate techniques to resolve.
I managed to draft the surfaces you were having problems with by using a Variable Section Sweep. First, I had to remove the micro-rounds in the corners (see slides below). I used the Complete Loop option of a Variable Section Sweep (VSS) to achieve this. I detailed the steps to accessing this option below.
Your geometry is the real culprit here, though. I realize you're trying to use a stylized piece of geometry- like a logo. These are often very "swooshy" and artistic looking with lots of curves and splines and conics. From experience I can tell you Creo can't always handle drafts on these surfaces due to the self-intersecting nature of those drafts. for example, in those tight "turns" (especially the ones circled in red below featuring the rounds), drafting becomes very tough.
You're going to have a tough time with a logo-like sketch. It's always going to be messy with far too many controlling dimensions. My best advice would be to spend time simplifying the sketch. Try to generate the shape you want with as few dimensions and as little "crazy geometry" as possible. This will likely take some time but the payoff will be functional draft without the need for a sweep or surface geometry to create the piece you want.
Take a look at the slides below... click them for a larger, more readable image.
I hope this helped a little...
Thanks!
-Brian
