I haven't seen or heard of this before. Check the prefs to be sure that all the sliders are pushed all the way to the right for High Quality Display.
You can also try trashing your prefs. See Replace Your Preferences
All the sliders are completely to the right. Anti-aliasing is also turned off.
Trashing preferences seems to have worked. Thanks!
Anti-aliasing is also turned off.
I believe that was the problem.