Hey Colin -
I took a quick look at telltalechart.org, and it appears you have tabs turned off. Don't know how that snuck in there, but the URL is pretty clear on the matter::
<iframe frameborder="0" marginheight="0" marginwidth="0" allowtransparency="true" class="tableauViz" width="654" height="665" style="margin: 0px; padding: 0px; border: none; width: 654px; height: 665px; display: block; " src="http://public.tableausoftware.com/views/unionsinequalityandright-to-work/Dashboard3?:embed=y&:host_url=http%3A%2F%2Fpublic.tableausoftware.com%2F&:tabs=no&:toolbar=yes&:animate_transition=yes&:display_static_image=yes&:display_spinner=yes&:display_overlay=yes&:display_count=yes&:loadOrderID=0"></iframe>
Note how "tabs=no" on the URL above?
Take a look at your markup, and make sure that you have:
<parameter name="tabs" value="yes" />
The graph up now is actually a different one. Instead of trying to maintain the tabbed worksheets, I reconfigured the data with year as a field (before I was working from a separate excel worksheet for each tab), and added "year" as a filter. But I see now the "tabs=no" code and will use that next time. Thanks alot