I am running R2011b x64 in Windows 7 (64 bit) on a Velocity Micro machine. I have been reproducibly running into a very peculiar and frustrating error. With certain image processing toolbox routines, a custom written script will start, and then with absolutely no warning, the computer will simply power down -- no blue screen, no beep, no error of any kind -- just powers down instantaneously. It will happen at the same point in the matlab script every time. Anyone else seen anything like this?