A problem that I've seen with the new lab launcher is sometimes when a students starts it, the lab launcher will appear in the task bar, but not on the screen. Clicking the task bar does not work. Right clicking the lab launchers and selecting Restore does not help either. Try this:
- Right click the Lab Launcher in the tesk bar.
- Click Move.
- Press the left arrow button.
- now move the mouse.
The lab launcher app should appear on the screen.