Share your thoughts on DirectQuery for Power BI datasets and Azure Analysis Services (preview)

Hi - really pleased when this blog announcement came out.  I had every user who needed access to anything as a Member of the Premium workspace.  I've changed them all to Viewers but now multiple users are only seeing an error on any visualisation from 1 'base' dataset that's part of the composite model.  They can see visualisation from the others datasets that make up the model in the same reports, just not that one.  That report set is published by another user, from a SQL database, to the workspace.  Is this a known exception or should I open a support ticket?