My parameter has a query as it's value source, with the same query as the DEFAULT VALUES source. I can't seem to find any dependency, as the filters on the Tablix use all but one of the non-hidden parameters, and use that remaining one as part of a Group By expression. I've found in the past that parameter order can matter, but it seems that even if this is the last one in the parameter list before the ones that are hidden, it still doesn't populate with it's default values. I will try moving all the hidden parms up above all the other ones and see if that matters, but gee whiz, folks, can't this be easier? Is there anything I might be missing, or questions I should be asking myself that perhaps I have yet to ask? Any/all help appreciated.