So I have been training on the task views but one thing that I always get is when they are in the close there is not a big enough divider of the custom tasks and close tasks. I think Custom should be the standard white and the close should be a light purple to show this is the actual month close. (also due dates in order should naturally be a think on all sections and it doesn't happen. really frustrating.
Visually the purple outline has helped when hovering over tasks, but its still hard to see the divide and the most mis-understood part of Double that I have to explain more than anything. Having a darker divider could also help but I like having the sections a totally different color to really stand out.