I am seeing a pattern to this problem now. I am as well using data driven pages, ALSO with a negative rotation and experiencing these extra lines that match other polylines in my map. I adjusted to a positive rotatation, but this is still ocurring. I also have numerous shapefiles, and two data frames on my map. Does this apply to anyone else with this issue? Not sure what the work around is right now... but hopefully ESRI can recreate this to fix it.
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