I've noticed several activeUsers have tried to disable the vertical 1 pixel delimiter that appears along the left of expanded paragraphs by modifying the definition for the expandedHigh CSS class like this:

.expandedHigh {
    border-left: 0px solid silver;
}

Because of the way aR's javascript code works, it is actually better to use

border-left: 1px solid COLOR;

Where COLOR is the proper encoding of your template's background color. This prevents the annoying 1 pixel drift when hovering with the mouse cursor over an expanded wedge.