MacDraw II: Black Streaks, Stripes or Objects in Printout
Documents printed to a LaserWriter have been reported to have unexplained streaks or solid black objects that appear in random locations throughout the printout.
This information was provided by Claris Corporation on 16 March 1998, and incorporated into Apple Computer's Tech Info Library.
Try the following workaround:
Select All.
Turn Autogrid off.
Move object one pixel to the right then one pixel to the left.