Well i recently had to downgrade my powermac g5 with radeon x800xt to tiger....and now everything is updated..and when a box's option is clicked, a small box remains on the screen in the color of the thing clicked or highlighted. There is now a strange yet quiet squeeling noise coming from my computer only when i scroll. Also if i leave the mouse on the middle of my web page when i scroll, the words it travel over leave a tail of distorted boxes the size of the mouse arrow behind it. I dont know if its a setting, or if something hardware wise is failing, because it didnt happen when i had leopard in hours ago.