[Forums] BarChart Tooptip problem after platform upgrade

I found that yesterday but wasn't sure how it worked so I just now started playing with it in debug.  The value that was getting assigned was empty (an attribute of a structure that was not being assigned anywhere prior).  I'm not really sure how this was (and is) working in production on V8, but it appears as though there is some default tooltip that was being used if no value was assigned (or if the value assigned is an empty string) - that value appears to be the "Label: Value".  It appears that changed somewhere going to V9.1.  It seems as though the default value assigned to the tooltip now is the "Label: 0".  At least that seems to be what I am seeing.

Also, what is the DataSeriesName used for?

Thanks for pointing me in the right direction.
Cory