Hi Cory,
I was not expecting that misbehavior to be related to the upgrade itself.
Still, my advise would be for you to see what list is feeding the Bar Chart webblock.
That list is composed of several data points (DataPoint structure). One of the fields of that structure is the "Tooltip".
You should confirm that you are setting it's content to the correct value for it to be displayed.
Does it helps?
I was not expecting that misbehavior to be related to the upgrade itself.
Still, my advise would be for you to see what list is feeding the Bar Chart webblock.
That list is composed of several data points (DataPoint structure). One of the fields of that structure is the "Tooltip".
You should confirm that you are setting it's content to the correct value for it to be displayed.
Does it helps?