We implemented the Marketing Cloud Audiences, to be able to use segments created in SiteCatalyst in Test and Target.
We just launched a test experiment to see if it works correctly, we created a test with only one version and target that test to one of our marketing cloud audience, but we don´t see the version that we should.
Also we see that in the marketing cloud audience some segments indicate us that current size is collecting data and other appear with a number, what does that mean?
I realize this is a very old question and you've likely already found your answer. incase anyone else finds this post I'll link to a more recent post that will likely answer the question