It would be useful to have options to control whether (and what) warning icons / messages are displayed in user- (as opposed to design-) mode. At the moment, warning messages appear above the visualization controls when, for example, not all data can be displayed. These look scary as if "something has gone wrong", particularly in a pre-sales presentation scenario. I think the newer half-triangle, warning icon approach is a step in the right direction on this, but should be toned down so that the messages are less in your face and more discrete. Maybe changing them to information icons (or the more "..." menu) would help? You might also consider extending the "toolbar icon" / more "..." approach to (optionally) allow other background information (such as statistics on the data that underpins a given control) to be displayed in a pop-up pop-up window in the same way?...
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