Gantt chart bug

I downloaded the custom visualization and the options seem different in the one available now. I see the option to include a "Parent" which will be useful but I think if there was an update that something was broken in the process. No matter what I try it is not possible to color anything differently, it seems the Legend is not functioning. It is mentioned in the title but I cannot get it to display.

Also, when I group tasks together (which is a great feature) I do run into a problem for tasks that occur near each other in time. The titles overlap and cannot be read. Is there a way to group the tasks but not have titles overlap?