Hey guys, I know not many have this issue but if you are using a Wacom tablet with Lion or Mountain Lion and you experience input lag after pressing and express key, go here: http://www.wacom.com/en/customercare/drivers.aspx And download the 6.1.7-5 driver (yes its very old). This fix worked for me and a few others. This happens in any application (ZBrush, Photoshop, Painter, etc). If you have that problem and the fix works for you please post below and list what kind of tablet you have. I'm trying to get a list across several sites to send to Wacom. My tablet is an Intuos 4 Wireless.