A number of logged-in student machines in both labs with Duo having been launched froze after a period of not being in use. The freeze can be described as the mouse pointer not being move-able on the screen. CTL ALT DEL won't restart the machines in this case, just the restart button will. The activity at point of freezing in this case seems only to be that Sanako had been used, but not in use (play, etc) at point of freezing. In some few cases (but not all) I was aware that a minimized window for the ez virus was located at the bottom of the screen. I had never heard of such a number of machines, having been in use, freezing during a class before in these labs. Lab B had 8 machines freeze, and lab C 7, with 3 of them freezing a second time after a restart and re-sending of a media file. Perhaps newer machines will prevent some of these crashes. However, this type of extensive crash while using only Sanako seems to be a recent problem as far as I know. Eoin