Any idea what's causing it? I'm guessing there isn't a fix for it =/
If it is not broke, don't fix it!
You can always
stop play, wait for redraw, open the plug, wait for redraw, adjust plug-in, and press "play".
I guess the "redraws" are the price to pay for having such a good sound rig with optimized software for MacOS9.
The Protools Free Win version has not screen redraws, but has no sound.
It never worked for me and make me really impressed when I listen for the first time the "Be There" Demo from protools on a G4 400 with a 001 14 years ago...
Screen Redraws? Who matters? It
works .
It is not responsive? Maybe you can try give different values of RAM for protools and DAE, dunno. It works stock. Y.M.M.V.
Do the redraws brakes your workflow? Maybe if it brakes you, you can go to the dark side (OSX) and have a ride there.