For a clustered column bar chart with hierarchy, in the properties for the X-axis, there's an option to turn concatenation off. If you drill down the hierarchy, even when option turned off it is still concatenating the fields for the x-axis label. Is this intended behavior?
Another strange behavior I've noticed is when trying to adjust the title of a visual, you turn title on then click in the text field to start modifying the title name. As you're typing input if you do a space, it will "knock you out" of focus of the pane and you need to click on text field again to continue editing. This is intermittent, I can't seem to repro every time. Try doing it with fresh visual rather than existing one.