One rule I have that might be causing this problem is never to use a point control on the last point of an end condition. If you have a horizontal AND vertical you want an end condition to follow, then assign the horizontal and vertical as the targets of the end condition component and do not use point controls. Point controls are fine if you want to set a ditch grade inside an end condition, but the last point of an end condition always needs the freedom to seek its target.
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