When I use my MX Revolution mouse, I get a delay when I want to access all the apps open. I use the lower thumb button to show the apps, and there is 3-5 second delay, then it will either open, or open and close real quick. I get that after my iMac has been running for only 30 minutes. If I restart, it doesnt do it in the beginning, but will start to do it later on. I was wondering if anyone had any suggestions to correct this problem. I had this problem when i was running Lion as well, on a different SSD. I thought it would stop after I went with a Samsung 830 SSD and ML, but I still get the same issues. I would set the zoom button on the mouse to open Launchpad, and I would get the same delay btw.