Question
What is the correct way to Sector a map? Even when I am 100% postive that the sectors line up I still get walls that go missing and glitches in the Map.
Answer
Well generally it's best to use as few sectors as possible, but when you can save alot of space, it's worth it to make a new sector. And example would be that if you're going up a mountain, you'd want several sectors, one for the lower altitude part, and others for higher up.
As for fixingbugs, you want sectors to touch each other exactly. They shouldn't overlap, or not meet. One time I thought I had them perfect, but when I set the grid size smaller, I found out they were only small grid off. I don't know how it happened... but it did. You may want to try setting the grid size small to check if you have that problem.
Other than that... just keep on trying different stuff to try to fix your problems.
-George