Evince and other open-source PDF viewers screw up schematics (output from orcard, cadence, etc.) whereas adobe reader renders them properly. They also don't search as well in schematics (adobe's app has better search options). The rendering thing is the worst and to make it even worse I don't have any schematics that exhibit this and can also be shared as a sample on a bug report (they cover proprietary circuits). Ugh.