A new "feature" of xl is dynamically created short markers. These happen whenever you move a line and xl thinks there might be a tiny chance that a short may be created such as a metal5 going over a metal2 line.
It's obvious what I think of this new feature. It would be great if it actually worked but since it doesn't
How do I turn off the markers? Note that these are NOT the object markers whose visibility is sometimes controlled by the layer palette or LSW.