I’ve got the same problem.
I find that /checkout/cart/ will work (something that Trevor in the Optimizer webinar pointed out) whereas /checkout/onepage/success/ won’t. So I’m playing around with a fake conversion page as per Trevor’s suggestion.
Then I simply pasted on the Original Page the control script and tracking script to the CMS>ManagePage>MyPage>Content Page, above and below my static blocks respectively.
Then I pasted on the Variant Page the tracking script to the CMS section> Content Page below my static blocks.
That seems to be working, but hopefully someone will post a solution to make this work via the CMS section>ManagePage>MyPage>Page View Optimization as its supposed to. Or point out a better solution.