[comp.sys.atari.st] VIP Professional, Streaks on the screen

FCTY7284@RYERSON.BITNET ("Hiscocks, Peter") (01/17/90)

I'm running VIP on a Mega 2, mono screen, and the display gets horizontal
 streaks at random places. I dimly remember this as being related to the
 blitter, but turning it off has no effect. Any ideas from net land?
                                   Peter