If lights stay on after a global command make sure they aren't attached to a control box with an address higher than what you have told Dasher you have connected to the computer.
One good rule to follow is that one global command is followed by another, opposite global command. However, this won't always fit the situation.
Try to group together channels that will change at the same time and, if possible, keep them in one control box. If the channels that are changing cover more than one control box, use control boxes that have addresses next to each other (for example, control boxes 6 & 7).
When inserting or deleting columns try do these operations as close to the right edge of the grid as possible. This will speed these operations up.
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