Choppy GUI with Logic 9.1.8 Multipressor

Hello,

Recently I have had a problem with Logic 9.1.8's multipressor slowing down the frame rate of all open AU windows. All the other audio units work fine independently and with each other. The problem occurs only when the Multipressor window is open. The multipressor works fine in waveburner.

Has anyone else encountered this problem. I've seen other threads about general choppy gui, but none seem to have solutions.