This is strange. It looks like you may have found a bug. There is something it doesn't like about Measure Values on the axis. If you remove that and just make it a simple bar chart, for example, it works just fine. See this working example with a bar chart: Tableau Public
You should report this to Tableau Public. Contact Us | Tableau Public (the best way is to just tweet the problem to them--I'm happy to do it for you if you don't feel comfortable with it).
Switched to a simple bar chart and it is working fine now.
Thank you so much for your help!!!!