Symptom
A red cross appears on the teacher or student icon.
Cause
This means that our software cannot connect to the audio device of that PC. Which audio device is used depends on the type of installation:
Live Pro installation: Pro Card
Live installation:
onboard audio card
USB headset
Solution
Live Pro installation
Reboot the system.
If this doesn't solve the issue, check whether the Pro card is configured properly.
If the LED on the Pro card is red, pull out the USB cable and plug it in again.
Live installation
Reboot the system.
Plug in an audio device.
If it is already connected, pull it out and plug it in again in another USB port.
If this doesn't solve the issue, please collect the log files.