strange behavior of ComputeOnDevice

[hygxy]

I've observed a strange behavior of the sample "ComputeOnDevice": I've built and deployed this app on HL1 successfully, but when I execute it on the HL1, sometimes 1)it works(i.e., visualization window showing canny edge detection) and somestimes 2)nothing is displayed. However, in both cases the python script "sensor_receiver.py" works correctly.

In the case where nothing is showed, a second air-tap will make the app to sometimes 1)display edge detection results of a static frame(not in real-time) and somestimes 2) keep showing nothing until I close the app.

I cannot resolve this issue by rebooting the device or redeploying the app(even with different target plattform versions). It seems like the visualization window of "ComputeOnDevice" shows just randomly.

Any suggestion is appreciated!