I have downloaded Robot C to all my laptops. I have one that will not show the NXT devices when I go to Debugger Window and select NXT devices. It was working then stopped. I figure a student did something that needs to be reset, but I can't figure what they did. All other windows open. I can poll the NXT brick, but once I go to debugger it closes the device window.

\What am I not seeing or understanding?

When you connect your robot to your PC, turn it on, then download the program to the robot... does the window just not show up? Are you able to get the window back on the screen?

In order to do this, follow these steps:
1) Download the program to the robot
2) WITHOUT CLOSING ANY BOXES, go to ROBOT > Debug Windows > NXT Devices

This should bring the window back to the screen.

The "Poll Brick" and "Devices" windows essentially do the same thing. The Poll Brick window will allow you to poll the inputs and outputs without downloading a program.

Let me know if you still need help