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I realize I am replying to a very old/dead thread, but, here goes anyways:
Rameet, I don't think I agree with your comment about there being only one unique solution isn't true. For some reason Pro/E / Creo simply locks up the control of the curve if you have curvature continuity at both ends (and don't add additional points). As proof that there are multiple solutions, you can set the end conditions back to tangency, move the points around, and when you set it back to curvature continuous, you get a different result. I found a similar thread here: http://www.eng-tips.com/viewthread.cfm?qid=210041.
PTC, if you are listening, it sure would be nice to be able to drag those control handles around while it is constrained to be curvature continuous...