>>Do you close the calibration file, in the task manager, before trying to run it again?
I tried both. If i close calibration process in task manager, the second time i run won't show anything. If i do not close, the second time i run will show the freezing screen.
>>Have you tried also disabling the firewall, and google softqware running in the background?
I already tried but the problem still persists.
One more thing: The first time i run, there will be a brief spins on cameras' LEDs and stops with numbers displayed. (1-3) I am not sure if these helps.
The OptiTrack SDK sample crashed when i selected "Multi" in "IDD_CAMERA_LIST" dialog box. It doesn't have the same problem when i opened each camera individually using "Open" in the same dialog box.