I use MC12 with MS Vista Ultimate. I am having a problem that MC12 is very slow to react to mouse clicks, keyboard presses etc. This is the only program that is acting up on this new machine. I am running MC11 right next to this machine on another computer and it works fine. All of my files on my Escient fireball which I am using as a server. I don't know if that's what the problem is. Thery is a very slight lag on MC11 with XP, but on VISTA it seems almost like the program is locked up. Any help would be appreciated.