Acrobat refreshing screen while drawing

I use adobe acrobat to draw simple arrows with text boxes,  basically showing where something has moved on a drawing from original installation.   Since the upgrade,  while I'm drawing arrows or whatever,  the drawing is refreshing itself constantly.  It will settle down and stop only if I stop but as soon as I try to draw a rectangle box or add text to that box or an arrow  (whatever)  the screen immediately starts refreshing the drawing.  It's like a tick that just keeps happening.   My co-worker has the same problem.  We have both uninstalled and reinstalled,  didnt do any good.   Can you help ?  Thanks