The task follow up flags are too similar now.
The update that just went into effect changed a lot of visual UI pieces. One of these it the colorization of the task follow up flags. The due today flag is not the solid color that it used to be and now is too similar to the other flag colors to stand out very well. Due today flags should visually stand out from the others, and now they don't.
I cannot agree more. There is no difference in colour between Due today and Custom and No Date flags.