When the Avidanet client software cannot initialize the audio system on the PC, a red cross is shown on top of the student icon in the Windows notification area.
the interpreterQ classroom view will show an exclamation mark next to the booth representation :
This indicates an issue with the Dante Virtual Soundcard of the PC. For troubleshooting steps please read following article :
https://support.televic-education.com/hc/en-us/articles/15386343125276/