Has anyone run into this issue while joining Tables from a WDC?  Basically as I join tables in Tableau the connector breaks.  For example I have the visual below where the data comes from a WDC.

This is the data source behind the visual

As I join a 4th table, the data source seems to working fine initially (the nulls are fine in this situation)

But, if I go back to the worksheet the visual is gone

If I go back to the data source the WDC is no longer functioning

I know it's not the specific table I joined as I can view the data fine if there isn't a join.   Has anyone else seen this?