[Anonymous]

Hi Blair, 

Welcome to the Support Community! 
Quick question:  has it ever worked with this setup?  Or are the Mac Airs new? 
Check if they are using a USB 2.0 or 3.0 port if they are new and its never worked with these. 

Either way, make sure you are using the latest version of ActivInspire/Driver. Disconnect the board from the USB, then go to our Planet website and download ActivInspire version 2.2, which I have linked here. 

Alternatively, give our Tech Support a quick call and they will talk you through the troubleshooting, your reference is : 00465094